SIST ISO 1502:1998
(Main)ISO general-purpose metric screw threads -- Gauges and gauging
ISO general-purpose metric screw threads -- Gauges and gauging
Gives details for the manufacture and use of gauges for checking ISO general purpose metric screw threads. Specifies the features of gauges which are recommended for checking external and internal screw threads of workpieces. Provides means of distinguishing between threads that comply with the limits of size and those that do not.
Filetages métriques ISO pour usages généraux -- Calibres à limites et vérification
Metrski navoj ISO za splošno uporabo - Mere in merjenje
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INTERNATIONAL ”
STANDARD
Second edition
1996-02-O I
IS0 general-purpose metric screw
- Gauges and gauging
threads
Filetages m&riques IS0 pour usages ghhraux - Calibres 9 limites et
vkifica tion
Reference number
IS0 1502:1996(E)
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IS0 1502:1996(E)
Contents
Page
. . . . . . . . . . . . . . . . . . . . . 1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Symbols and abbreviations
3
4 Types of gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Gauges for external threads of workpieces and their check plugs
3
and setting plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
.2 Gauges for internal threads of workpieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
.............................................. ............... 3
5 Gauging of workpieces
.......
5.1 Gauging of external threads . 3
4
5.2 Gauging of internal threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Inspection gauging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
...................................................... ....... 4
6 Reference temperature
..................................... 4
7 Function, checking and use of gauges
7.1 Gauges for external threads of workpieces and their check plugs
and setting plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
................ ............ 8
7.2 Gauges for internal threads of workpieces
8 Tolerance zones for the diameters of gauges (see figures 1 and
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2)
. . . . . . . . . 11
9 Tolerance zones for plain gauges (see figures 3 and 4)
10 Thread profiles for gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. 13
10.1 Profiles with complete flanks (see figures 5 and 6) . . . . . . . . . . 13
. . . . . . . . . . 16
10.2 Profiles with truncated flanks (see figures 7 and 8)
10.3 Displacement of the clearance groove for a profile with truncated
flanks ,.~.,. 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11 General features of screw gauges
. . . . . . . . . . . . . . . . . . . . . . . 19
11.1 Gauges for external threads of workpieces
II.2 Gauges for internal threads of workpieces . . . . . . . . . . . . . . . . . . . . . . . . 19
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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0 IS0 IS0 1502:1996(E)
II.3 Blunt start of thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Tolerances and permissible wear for pitch diameters of gauges
I2
....................................... ........ .................. 21
(see tables 4 to 9)
13 Formulae for calculation of gauge limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13.1 Screw gauges for external threads of workpieces . .*. 23
13.2 Plain gauges for the major diameters of external threads of
.................................. .............................. .........
workpieces 23
13.3 Screw gauges for internal threads of workpieces . . . . . . . . . . . . . 23
13.4 Plain gauges for the minor diameters of internal threads of
workpieces . . . 23
Annex
A Bibliography . . . 27
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0 IS0
IS0 1502:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 1502 was prepared by Technical Committee
ISO/TC I, Screw threads, Subcommittee SC 4, Verification.
This second edition cancels and replaces the first edition
(IS0 1502:1978), which has been technically revised.
Annex A of this International Standard is for information only.
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INTERNATIONAL STANDARD 0 IS0 IS0 1502:1996(E)
IS0 general-purpose metric screw threads - Gauges
and gauging
eter and virtual pitch diameter) lies inside the
1 Scope
specified limits.
In order to satisfy these two principles, this Inter-
This International Standard gives details for the
national Standard establishes requisite types and
manufacture and use of gauges for checking IS0
sizes of gauges for checking screw threads, the con-
general-purpose metric screw threads with a basic
ditions under which these gauges are to be used, and
profile in accordance with IS0 68.
rules for the inspection of the workpiece threads.
It specifies the features of the types of gauges (listed
in 4.1 and 4.2) which are recommended for checking
2 Normative references
external and internal screw threads of workpieces and
The following standards contain provisions which,
for the setting and checking of certain of the screw
gauges. through reference in this text, constitute provisions
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All standards
It is recognized that other methods of checking may
are subject to revision, and parties to agreements
be used, for example measurements with indicating
based on this International Standard are encouraged
instruments. Checking with gauges in accordance
to investigate the possibility of applying the most re-
with this International Standard is always decisive.
cent editions of the standards indicated below.
The aim of this International Standard is to provide Members of IEC and IS0 maintain registers of cur-
rently valid International Standards.
means of distinguishing between workpiece threads
that comply with the limits of size and those that do
IS0 1: 1975, Standard reference temperature for in-
not.
dustrial length measurements.
In order to ensure the interchangeability of workpiece
I so 68:--J, IS0 general-purpose screw threads -
threads and to avoid disputes between the manufac-
Basic profile.
turer and purchaser, the following principles should
be applied:
IS0 1938-l :-*I, Inspection of plain workpieces -
Part 1: Plain limit gauges.
a) the manufacturer should not deliver any work-
piece thread whose actual thread size (e.g. pitch
diameter and virtual pitch diameter) lies outside
3 Symbols and abbreviations
the specified limits;
The symbols and abbreviations used in the text and
b) the purchaser should not reject any workpiece figures in this International Standard are listed in
thread whose actual thread size (e.g. pitch diam-
table 1.
1) To be published. (Revision of IS0 68:1973)
2) To be published.
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IS0 1502:1996(E)
Table 1 - Symbols and abbreviations
Symbol Symbol
or or
Definition Definition
abbrevi- abbrevi-
ation ation
Width of the clearance groove at the major Radius of the clearance groove of the root
4 r2
profile of GO and NOT GO screw plug gauges
diameter of a gauge thread profile with com-
plete flanks
S Displacement of the clearance groove from
Width of the clearance groove at the minor the centre of a thread profile with truncated
h2
diameter of a gauge thread profile with com- flanks
plete flanks
Tolerance for each flank angle of a profile with
T,,l2
Width of the clearance groove at the major complete flanks
4
and minor diameter, respectively, of a gauge
Tolerance for each flank angle of a profile with
T,2/2
thread profile with truncated flanks
truncated flanks
Basic major diameter of a workpiece thread
d, D
Tolerance on the pitch diameter of GO and
CP
Basic minor diameter of the internal thread of NOT GO screw check plugs, wear check plugs
4
a workpiece and setting plugs
Basic pitch diameter of a workpiece thread Tolerance for the major diameter of the
Td
4 D2
external thread of a workpiece
es Fundamental deviation of the external thread
of a workpiece (it is zero for tolerance position T Tolerance for the pitch diameter of the
d2
h) external thread of a workpiece
EI Fundamental deviation of the internal thread T Tolerance for the minor diameter of the
Dl
of a workpiece (it is zero for tolerance position internal thread of a workpiece
HI
T Tolerance for the pitch diameter of the internal
02
For thread profiles with truncated flanks, the thread of a workpiece
Fl
radial distance between the pitch diameter
Tolerance for the pitch of a gauge thread
TP
line and the end of the straight part of the
flank in the direction of the crest Tolerance for the pitch diameter of GO and
TPL
NOT GO screw plug gauges
For thread profiles with truncated flanks, the
radial distance between the pitch diameter Tolerance for the pitch diameter of GO and
TR
line and the end of the straight part of the NOT GO screw ring gauges
flank in the direction of the root
Amount available for permissible wear of GO
wGO
screw plug gauges and GO screw ring gauges
H Height of the triangle of a thread profile
Tolerance on the diameter of plain plug Amount available for permissible wear of
4 WNG
gauges NOT GO screw plug gauges and NOT GO
screw ring gauges
Tolerance on plain ring gauges and the separ-
H2
ation of the plain faces of calliper gauges Distance between the middle of the tolerance
zone H, of a GO plug gauge and the lower
Tolerance on the size of check plug gauges for
HP
limit of the minor diameter of a workpiece
plain calliper gauges
Distance between the middle of the tolerance
LML Least material limit
zone H2 of a GO calliper gauge or a GO ring
gauge and the upper limit of the major diam-
m Distance between the middle of the tolerance
zones TR of a screw ring gauge and Tcp of a eter of a workpiece
GO check plug
Distance between the middle of the tolerance
ZPL
MML Maximum material limit zone TpL of a GO screw plug gauge and the
lower limit of a workpiece thread
P Pitch
Distance between the middle of the tolerance
Radius of the clearance groove of the root
Yl
zone TR of a GO screw ring gauge and the
profile of GO and NOT GO screw ring gauges
upper limit of a workpiece thread
or of GO and NOT GO screw calliper gauges
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0 IS0 IS0 1502:1996(E)
4.2 Gauges for internal threads of
4 Types of gauges
workpieces
The following types are recommended:
- GO screw plug gauges;
4.1 Gauges for external threads of - NOT GO screw plug gauges;
workpieces and their check plugs and setting
- plain GO plug gauges;
PUF
- plain NOT GO plug gauges.
The following types are recommended:
solid GO screw ring gauges;
5 Gauging of workpieces
adjustable GO screw ring gauges;
It is not necessary to use all the gauges mentioned in
clause 4. However, in gauging the limits (checking
check plugs (GO and NOT GO) for new solid GO
that the tolerances have been respected), it is essen-
screw ring gauges;
tial that a GO and NOT GO gauging always be carried
out with one of the GO screw gauges and one of the
setting plugs for adjustable GO screw ring gauges;
NOT GO screw gauges referred to in 4.1 and 4.2.
wear check plugs for solid or adjustable GO screw
5.1 Gauging of external threads
ring gauges;
Preferably a solid or adjustable GO screw ring gauge
GO screw calliper gauges;
should be used for gauging an external thread.
setting plugs for GO screw calliper gauges;
To save time, for convenience in checking, or in cases
where a GO screw ring gauge is not applicable, a GO
NOT GO screw calliper gauges;
screw calliper gauge may be used.
setting plugs for NOT GO screw calliper gauges;
It is, however, recommended that gauging with GO
screw calliper gauges should be supplemented by
solid NOT GO screw ring gauges;
random sampling with a GO screw ring gauge, so that
when a large number of parts are checked with a GO
adjustable NOT GO screw ring gauges;
screw calliper gauge, a certain percentage receives
an additional check with a GO screw ring gauge, thus
check plugs (GO and NOT GO) for new solid NOT
giving greater assurance of interchangeability be-
GO screw ring gauges;
tween the workpiece threads.
setting plugs for adjustable NOT GO screw ring
A GO screw calliper gauge should not be used if the
gauges;
manufacturing process is likely to cause deviations in
the workpiece thread, which this gauge is not certain
wear check plugs for solid or adjustable NOT GO
to detect, for example local pitch errors in milled
screw ring gauges;
threads or burrs at the start of the thread. Further-
more, a GO screw calliper gauge is not suitable for
plain GO ring gauges;
checking non-rigid parts, for example thin-walled parts
which would be deformed by this gauge. In these
plain GO calliper gauges;
cases, checking should be carried out with a GO
plain NOT GO calliper gauges;
screw ring gauge.
Similarly, only solid or adjustable NOT GO screw ring
plain NOT GO ring gauges;
gauges should be used for non-rigid workpieces, for
example thin-walled parts which would be deformed
check plugs for new plain GO calliper gauges;
by checking with a NOT GO screw calliper gauge.
check plugs for new plain NOT GO calliper gauges;
A NOT GO screw calliper gauge is used for checking
the simple pitch diameter of an external thread.
wear check blugs for plain GO calliper gauges.
3
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0 IS0
IS0 1502:1996(E)
plugs which belong either to the manufacturing
GO and NOT GO gauges are used for gauging the
plant (manufacturer) or to the inspector (pur-
major diameter of an external thread of a workpiece.
chaser) or, as far as screw plugs are concerned,
Whether a calliper or ring gauge is used is determined
by direct measurement.
by the form and rigidity of the workpiece. Plain ring
gauges should be used on non-rigid parts (see
The inspector uses his own gauges for gauging
b)
IS0 1938-I).
the workpiece threads.
5.2 Gauging of internal threads
In cases of dispute it is recommended that the
product be accepted if it is shown to be satisfac-
GO and NOT GO screw plug gauges are used for
tory by any gauge of the type concerned known
gauging internal threads of a workpiece; GO and NOT
to be within the requirements of this International
GO plain plug gauges are used for gauging the minor
Standard (taking into consideration the admissible
diamc I hter of a workpiece thread (see IS0 1938-l).
wea r).
c) The inspector uses his own inspection gauges for
53 . Inspection gauging
gauging the workpiece threads.
5.3.1 By the manufacturer
The position of the tolerance zone for these
gauges shall be such as to ensure that the pur-
In general, the inspection department that checks the
chaser does not reject threads whose actual size
threads made in a workshop may use the same kind
lies within the limits specified for the workpiece.
of gauges as are used in the workshop.
This International Standard does not specify which
Disagreement between manufacturing and inspection
gauges are to be used by the inspector; it only rec-
can occur when products close to the limits of sizes
ommends that the purchaser inform the manufacturer
are gauged.
when ordering what procedure will be employed for
the inspection of the workpiece threads. Worn
When disputes do arise, it is recommended that the
gauges shall not be used for sample inspection.
product be accepted if it is shown to be satisfactory
by any gauge of the type concerned known to be
6 Reference temperature
within the requirements of this International Standard
(taking into consideration the admissible wear).
In accordance with IS0 1, the dimensions of both the
In cases of dispute, checking of the ring gauges by gauge and the workpiece are related to a temperature
check plugs is decisive if there is no other agreement of 20 “C.
between the manufacturer and purchaser.
If the workpieces and gauges have the same coef-
The possibility of disputes can be reduced to a ficient of linear expansion (e.g. steel workpieces and
NOTE 1
minimum by grading the gauges so that those used by
steel gauges), the checking temperature may deviate
manufacturers provide a more stringent check than those
from 20 “C without detriment to the results, provided
used on inspection. Generally, this can be achieved by
that the temperatures of both gauges and workpieces
issuing to the workshops new or only slightly worn GO
are the same.
gauges and slightly worn NOT GO gauges. Inspection
should be made with GO gauges which are approaching the
If the workpieces and gauges have different co-
condition of maximum permissible wear and with new NOT
efficients of linear expansion [e.g. steel workpieces
GO gauges.
and carbide gauges or brass workpieces and gauges
of steel (or carbide)], the temperature of both shall be
5.32 By the purchaser
(20 + 2) “C at the time of gauging. Otherwise the
difference between the thermal expansions of the
There are three possible procedures, as listed below,
workpiece and the gauge shall be taken into consid-
for inspection of workpiece threads on behalf of the
eration.
purchaser by an inspector who does not belong to the
manufacturing plant concerned.
7 Function, checking and use of gauges
a) The inspector gauges the workpiece threads with
Throughout this clause, the designations of para-
the manufacturer’s gauges.
graphs are as follows:
In this case, the accuracy of the gauges used may
a) function;
be checked by means of check plugs and setting
4
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Q IS0 IS0 1502:1996(E)
7.1.2 Screw check plugs for new solid GO screw
b) control;
ring gauges
c) use.
a) GO and NOT GO screw check plugs are used to
NOTE 2 In the absence of b), there is no specification for
check the limits of the pitch diameter of a new
control.
solid GO screw ring gauge. A GO screw check
plug checks the GO limit of the total profile of a
new solid GO screw ring gauge.
7.1 Gauges for external threads of
c) The GO screw check plug, when screwed by
workpieces and their check plugs and setting
hand without using excessive force, shall pass
plugs
through the new solid GO screw ring gauge.
The NOT GO screw check plug, when screwed
7.1.1 Solid or adjustable GO screw ring gauges
by hand without using excessive force, may enter
into both ends of the new solid GO screw ring
a) A GO screw ring gauge checks the virtual size of
gauge, but by not more than one turn of
the external thread (gauging the virtual pitch di-
thread3).
ameter); i.e. it checks the maximum material limit
of the pitch diameter, taking into account devi-
7.1.3 Setting plugs for adjustable GO screw ring
ations of form and pitch errors and errors in flank
gauges
angles, which produce an apparent enlargement
of the pitch diameter (virtual pitch diameter) of
a) A setting plug which comprises two successive
the workpiece. In addition, this gauge checks
portions, one with complete flanks and the other
whether the length of the straight flank is ad-
with truncated flanks, is used to set an adjustable
equate; i.e. that the rounding at the root of the
GO screw ring gauge.
profile of the workpiece thread does not
encroach too far upon the flank of the thread. The
It is not essential to use a double-length setting
major diameter of the external thread is not
plug if the GO screw ring gauge is checked with
checked by this gauge.
a NOT GO screw check plug (see 7.1.2) after it
has been adjusted.
Checking with the GO screw ring gauge is es-
sentially in accordance with the Taylor principle
The GO screw ring gauge shall be set on the
b)
(see clause 1 I).
portion of the setting plug with complete flanks.
b) A solid GO screw ring gauge manufactured ac-
c) The portion of the setting plug with truncated
cording to the specified sizes shall be checked
flanks, when screwed by hand without using ex-
by GO and NOT GO screw check plugs and shall
cessive force, shall pass through the GO screw
be monitored regularly with a wear check plug.
nng gauge.
If a NOT GO screw check plug is not used, other
When the portion with truncated flanks of the
provisions (e.g. direct measurement) shall be
setting plug is screwed through the screw ring
made so as to ensure that the maximum permit-
gauge, there shall be no perceptible clearance
ted size of the pitch diameter of a new GO screw
between the plug and the ring. If there is a
ring gauge is not exceeded. Checking of ring
clearance, the ring gauge shall be lapped and ad-
gauges with check plugs is preferable to all other
justed in accordance with the manufacturer’s in-
forms of control.
structions to the correct form and size.
An adjustable GO screw ring gauge shall be set
7.1.4 Wear check plug for solid or adjustable GO
to its setting plug and shall be monitored regularly
screw ring gauges
with a wear check plug.
c) The GO screw ring gauge, when screwed by a) A wear check plug is used to ascertain that the
hand without using excessive force, shall pass wear limit of the pitch diameter of a GO screw
over the whole length of the workpiece thread. ring gauge has not exceeded the wear limit. It
embodies the pitch diameter of a GO screw ring
If assembly is not possible, the workpiece thread
gauge at the specified limit of wear.
does not comply with the specification.
3) The one turn of thread is determined when withdrawing the check plug.
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IS0 1502:1996(E) 0 IS0
c) The wear check plug, when screwed by hand a clearance, the anvils of the GO screw calliper
without using excessive force, may enter into gauge shall be adjusted.
both ends of the GO screw ring gauge, but by not
When put on the setting plug, the GO screw
more than one turn of thread3).
calliper gauge may be moved slightly to and fro
If the plug can be screwed in by more than one in a circumferential direction.
turn of thread, the GO screw ring gauge no
longer meets the specification.
7.1.7 NOT GO screw calliper gauges
7.1.5 GO screw calliper gauges
a) A NOT GO screw calliper gauge checks the
minimum limit of the pitch diameter. It operates
A GO screw calliper gauge checks the maximum
a)
very largely in accordance with the Taylor prin-
limit of the pitch diameter in an axial plane, as
ciple [see figure I Oa)].
apparently increased by errors of pitch and flank
b) The NOT GO screw calliper gauge shall be set
angle in the workpiece. Furthermore, it checks
with the setting plug specified.
whether the length of the straight flank is ad-
equate, for example that the rounding of the root
c) The NOT GO screw calliper gauge shall not pass
of the profile does not encroach too far upon the
over the workpiece except for the first two
flank of the thread. The major diameter of the
threads of the workpiece thread. The checking
external thread, however, is not checked.
shall be carried out under the same conditions of
presentation as the adjustment by means of the
With regard to the embodiment of the virtual
pitch diameter, a GO screw calliper gauge seri- setting plug; it shall take place in at least three
ously violates the Taylor principle (e.g. periodic positions, evenly distributed over the circumfer-
errors of pitch and deviations of form). ence.
If the gauge thread profile corresponds to
b) The GO screw calliper gauge shall be set with the
figure IO b), each gauging shall be repeated by
setting plug specified.
displacing the gauge axially by one thread pitch.
c) Workpiece threads are generally checked by the
GO screw calliper gauge under its own weight
7.1.8 Setting plugs for NOT GO screw calliper
or in accordance with a fixed working load to
gauges
correspond with the method of adjustment of the
gauge.
a) The NOT GO anvils of a screw calliper gauge shall
be set with a setting screw plug.
The GO screw calliper gauge shall accept the
workpiece thread at three positions at least,
c) The NOT GO screw calliper gauge shall pass over
evenly distributed over the whole circumference
the setting plug under its own weight or under a
of the thread. If the GO screw calliper gauge
fixed load. If the calliper will not pass over or if
cannot pass over the workpiece thread, than the
there is a clearance, the NOT GO screw calliper
workpiece thread does not comply with the
gauge anvils shall be adjusted.
specification.
When put on the setting plug, the NOT GO screw
When put on the workpiece, the GO screw
calliper gauge may be moved slightly to and fro
calliper gauge may be moved slightly to and fro
in a circumferential direction.
in a circumferential direction in order to minimize
the effects of friction.
7.1.9 Solid or adjustable NOT GO screw ring
In case s of d ispute, gauging with a GO screw ri gauges
w
prefe rably of the solid type 1, is decisive.
we,
w
a) A NOT GO screw ring gauge is intended to check
whether the actual pitch diameter of a workpiece
7.1.6 Setting plugs for GO screw calliper gauges
exceeds the specified minimum size. Checking
with a NOT GO screw ring gauge does not cor-
a) The GO anvils of a screw calliper gauge shall be
respond to the Taylor principle when checking
set with a setting screw plug.
rigid workpieces. In cases of non-rigid work-
c) The GO screw calliper gauge shall pass over the
pieces, departure from the Taylor principle is of
setting plug under its own weight or under a fixed less importance because of the flexibility of the
working load. If this is not possible or if there is workpieces.
---------------------- Page: 10 ----------------------
0 IS0
IS0 1502:1996(E)
b) NOT GO screw ring gauge to the specified pitch
A solid NOT GO screw ring gauge manufactured
according to the specified sizes shall be checked diameter.
by GO and NOT GO screw check plugs and shall
It is not essential to use a double-length setting
be monitored regularly with the wear check plug.
plug if the NOT GO screw ring gauge is checked
If a NOT GO check plug is not used, other pro- with a NOT GO screw check plug as described in
visions shall be made to ensure that the maxi-
7.1 .I 0 after the ring has been adjusted.
mum limit of the pitch diameter of a new NOT
b) The NOT GO screw ring gauge shall be set on the
GO screw ring gauge is not exceeded.
portion of the setting plug with complete flanks.
An adjustable NOT GO screw ring gauge shall be
c) The portion of the setting plug with complete
set with the setting plug specified and monitored
flanks, when screwed by hand without using ex-
regularly with a wear check plug.
cessive force, shall pass through a screw ring
c) A NOT GO screw ring gauge, when screwed by gauge.
hand without using excessive force on the work-
When the portion with truncated flanks of the
piece thread, may enter on both sides but by not
setting plug is screwed through the ring gauge,
more than two turns of thread4). If the gauge can
there shall be no perceptible clearance between
be screwed onto the workpiece by more than
the plug and the ring. If there is a clearance, the
two turns of thread, the thread does not comply
ring gauge shall be lapped and adjusted to the
with the specification. The NOT GO screw ring
correct form and size in accordance with the
gauge shall not pass completely over a workpiece
manufacturer’s instructions.
having a length of thread of three threads or less.
7.1.12 Wear screw check plugs for solid or
7.1.10 Screw check plugs for new solid NOT GO
adjustable NOT GO screw ring gauges
screw ring gauges
a) A wear screw check plug checks whether the
a) GO and NOT GO screw check plugs are used to
pitch diameter of a NOT GO screw ring gauge
check the pitch diameter li
...
SLOVENSKI STANDARD
SIST ISO 1502:1998
01-avgust-1998
Metrski navoj ISO za splošno uporabo - Mere in merjenje
ISO general-purpose metric screw threads -- Gauges and gauging
Filetages métriques ISO pour usages généraux -- Calibres à limites et vérification
Ta slovenski standard je istoveten z: ISO 1502:1996
ICS:
17.040.30 Merila Measuring instruments
21.040.10 Metrski navoji Metric screw threads
SIST ISO 1502:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
INTERNATIONAL ”
STANDARD
Second edition
1996-02-O I
IS0 general-purpose metric screw
- Gauges and gauging
threads
Filetages m&riques IS0 pour usages ghhraux - Calibres 9 limites et
vkifica tion
Reference number
IS0 1502:1996(E)
---------------------- Page: 2 ----------------------
IS0 1502:1996(E)
Contents
Page
. . . . . . . . . . . . . . . . . . . . . 1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Symbols and abbreviations
3
4 Types of gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Gauges for external threads of workpieces and their check plugs
3
and setting plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
.2 Gauges for internal threads of workpieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
.............................................. ............... 3
5 Gauging of workpieces
.......
5.1 Gauging of external threads . 3
4
5.2 Gauging of internal threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Inspection gauging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
...................................................... ....... 4
6 Reference temperature
..................................... 4
7 Function, checking and use of gauges
7.1 Gauges for external threads of workpieces and their check plugs
and setting plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
................ ............ 8
7.2 Gauges for internal threads of workpieces
8 Tolerance zones for the diameters of gauges (see figures 1 and
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2)
. . . . . . . . . 11
9 Tolerance zones for plain gauges (see figures 3 and 4)
10 Thread profiles for gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. 13
10.1 Profiles with complete flanks (see figures 5 and 6) . . . . . . . . . . 13
. . . . . . . . . . 16
10.2 Profiles with truncated flanks (see figures 7 and 8)
10.3 Displacement of the clearance groove for a profile with truncated
flanks ,.~.,. 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11 General features of screw gauges
. . . . . . . . . . . . . . . . . . . . . . . 19
11.1 Gauges for external threads of workpieces
II.2 Gauges for internal threads of workpieces . . . . . . . . . . . . . . . . . . . . . . . . 19
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
---------------------- Page: 3 ----------------------
0 IS0 IS0 1502:1996(E)
II.3 Blunt start of thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Tolerances and permissible wear for pitch diameters of gauges
I2
....................................... ........ .................. 21
(see tables 4 to 9)
13 Formulae for calculation of gauge limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13.1 Screw gauges for external threads of workpieces . .*. 23
13.2 Plain gauges for the major diameters of external threads of
.................................. .............................. .........
workpieces 23
13.3 Screw gauges for internal threads of workpieces . . . . . . . . . . . . . 23
13.4 Plain gauges for the minor diameters of internal threads of
workpieces . . . 23
Annex
A Bibliography . . . 27
---------------------- Page: 4 ----------------------
0 IS0
IS0 1502:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 1502 was prepared by Technical Committee
ISO/TC I, Screw threads, Subcommittee SC 4, Verification.
This second edition cancels and replaces the first edition
(IS0 1502:1978), which has been technically revised.
Annex A of this International Standard is for information only.
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD 0 IS0 IS0 1502:1996(E)
IS0 general-purpose metric screw threads - Gauges
and gauging
eter and virtual pitch diameter) lies inside the
1 Scope
specified limits.
In order to satisfy these two principles, this Inter-
This International Standard gives details for the
national Standard establishes requisite types and
manufacture and use of gauges for checking IS0
sizes of gauges for checking screw threads, the con-
general-purpose metric screw threads with a basic
ditions under which these gauges are to be used, and
profile in accordance with IS0 68.
rules for the inspection of the workpiece threads.
It specifies the features of the types of gauges (listed
in 4.1 and 4.2) which are recommended for checking
2 Normative references
external and internal screw threads of workpieces and
The following standards contain provisions which,
for the setting and checking of certain of the screw
gauges. through reference in this text, constitute provisions
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All standards
It is recognized that other methods of checking may
are subject to revision, and parties to agreements
be used, for example measurements with indicating
based on this International Standard are encouraged
instruments. Checking with gauges in accordance
to investigate the possibility of applying the most re-
with this International Standard is always decisive.
cent editions of the standards indicated below.
The aim of this International Standard is to provide Members of IEC and IS0 maintain registers of cur-
rently valid International Standards.
means of distinguishing between workpiece threads
that comply with the limits of size and those that do
IS0 1: 1975, Standard reference temperature for in-
not.
dustrial length measurements.
In order to ensure the interchangeability of workpiece
I so 68:--J, IS0 general-purpose screw threads -
threads and to avoid disputes between the manufac-
Basic profile.
turer and purchaser, the following principles should
be applied:
IS0 1938-l :-*I, Inspection of plain workpieces -
Part 1: Plain limit gauges.
a) the manufacturer should not deliver any work-
piece thread whose actual thread size (e.g. pitch
diameter and virtual pitch diameter) lies outside
3 Symbols and abbreviations
the specified limits;
The symbols and abbreviations used in the text and
b) the purchaser should not reject any workpiece figures in this International Standard are listed in
thread whose actual thread size (e.g. pitch diam-
table 1.
1) To be published. (Revision of IS0 68:1973)
2) To be published.
---------------------- Page: 6 ----------------------
IS0 1502:1996(E)
Table 1 - Symbols and abbreviations
Symbol Symbol
or or
Definition Definition
abbrevi- abbrevi-
ation ation
Width of the clearance groove at the major Radius of the clearance groove of the root
4 r2
profile of GO and NOT GO screw plug gauges
diameter of a gauge thread profile with com-
plete flanks
S Displacement of the clearance groove from
Width of the clearance groove at the minor the centre of a thread profile with truncated
h2
diameter of a gauge thread profile with com- flanks
plete flanks
Tolerance for each flank angle of a profile with
T,,l2
Width of the clearance groove at the major complete flanks
4
and minor diameter, respectively, of a gauge
Tolerance for each flank angle of a profile with
T,2/2
thread profile with truncated flanks
truncated flanks
Basic major diameter of a workpiece thread
d, D
Tolerance on the pitch diameter of GO and
CP
Basic minor diameter of the internal thread of NOT GO screw check plugs, wear check plugs
4
a workpiece and setting plugs
Basic pitch diameter of a workpiece thread Tolerance for the major diameter of the
Td
4 D2
external thread of a workpiece
es Fundamental deviation of the external thread
of a workpiece (it is zero for tolerance position T Tolerance for the pitch diameter of the
d2
h) external thread of a workpiece
EI Fundamental deviation of the internal thread T Tolerance for the minor diameter of the
Dl
of a workpiece (it is zero for tolerance position internal thread of a workpiece
HI
T Tolerance for the pitch diameter of the internal
02
For thread profiles with truncated flanks, the thread of a workpiece
Fl
radial distance between the pitch diameter
Tolerance for the pitch of a gauge thread
TP
line and the end of the straight part of the
flank in the direction of the crest Tolerance for the pitch diameter of GO and
TPL
NOT GO screw plug gauges
For thread profiles with truncated flanks, the
radial distance between the pitch diameter Tolerance for the pitch diameter of GO and
TR
line and the end of the straight part of the NOT GO screw ring gauges
flank in the direction of the root
Amount available for permissible wear of GO
wGO
screw plug gauges and GO screw ring gauges
H Height of the triangle of a thread profile
Tolerance on the diameter of plain plug Amount available for permissible wear of
4 WNG
gauges NOT GO screw plug gauges and NOT GO
screw ring gauges
Tolerance on plain ring gauges and the separ-
H2
ation of the plain faces of calliper gauges Distance between the middle of the tolerance
zone H, of a GO plug gauge and the lower
Tolerance on the size of check plug gauges for
HP
limit of the minor diameter of a workpiece
plain calliper gauges
Distance between the middle of the tolerance
LML Least material limit
zone H2 of a GO calliper gauge or a GO ring
gauge and the upper limit of the major diam-
m Distance between the middle of the tolerance
zones TR of a screw ring gauge and Tcp of a eter of a workpiece
GO check plug
Distance between the middle of the tolerance
ZPL
MML Maximum material limit zone TpL of a GO screw plug gauge and the
lower limit of a workpiece thread
P Pitch
Distance between the middle of the tolerance
Radius of the clearance groove of the root
Yl
zone TR of a GO screw ring gauge and the
profile of GO and NOT GO screw ring gauges
upper limit of a workpiece thread
or of GO and NOT GO screw calliper gauges
---------------------- Page: 7 ----------------------
0 IS0 IS0 1502:1996(E)
4.2 Gauges for internal threads of
4 Types of gauges
workpieces
The following types are recommended:
- GO screw plug gauges;
4.1 Gauges for external threads of - NOT GO screw plug gauges;
workpieces and their check plugs and setting
- plain GO plug gauges;
PUF
- plain NOT GO plug gauges.
The following types are recommended:
solid GO screw ring gauges;
5 Gauging of workpieces
adjustable GO screw ring gauges;
It is not necessary to use all the gauges mentioned in
clause 4. However, in gauging the limits (checking
check plugs (GO and NOT GO) for new solid GO
that the tolerances have been respected), it is essen-
screw ring gauges;
tial that a GO and NOT GO gauging always be carried
out with one of the GO screw gauges and one of the
setting plugs for adjustable GO screw ring gauges;
NOT GO screw gauges referred to in 4.1 and 4.2.
wear check plugs for solid or adjustable GO screw
5.1 Gauging of external threads
ring gauges;
Preferably a solid or adjustable GO screw ring gauge
GO screw calliper gauges;
should be used for gauging an external thread.
setting plugs for GO screw calliper gauges;
To save time, for convenience in checking, or in cases
where a GO screw ring gauge is not applicable, a GO
NOT GO screw calliper gauges;
screw calliper gauge may be used.
setting plugs for NOT GO screw calliper gauges;
It is, however, recommended that gauging with GO
screw calliper gauges should be supplemented by
solid NOT GO screw ring gauges;
random sampling with a GO screw ring gauge, so that
when a large number of parts are checked with a GO
adjustable NOT GO screw ring gauges;
screw calliper gauge, a certain percentage receives
an additional check with a GO screw ring gauge, thus
check plugs (GO and NOT GO) for new solid NOT
giving greater assurance of interchangeability be-
GO screw ring gauges;
tween the workpiece threads.
setting plugs for adjustable NOT GO screw ring
A GO screw calliper gauge should not be used if the
gauges;
manufacturing process is likely to cause deviations in
the workpiece thread, which this gauge is not certain
wear check plugs for solid or adjustable NOT GO
to detect, for example local pitch errors in milled
screw ring gauges;
threads or burrs at the start of the thread. Further-
more, a GO screw calliper gauge is not suitable for
plain GO ring gauges;
checking non-rigid parts, for example thin-walled parts
which would be deformed by this gauge. In these
plain GO calliper gauges;
cases, checking should be carried out with a GO
plain NOT GO calliper gauges;
screw ring gauge.
Similarly, only solid or adjustable NOT GO screw ring
plain NOT GO ring gauges;
gauges should be used for non-rigid workpieces, for
example thin-walled parts which would be deformed
check plugs for new plain GO calliper gauges;
by checking with a NOT GO screw calliper gauge.
check plugs for new plain NOT GO calliper gauges;
A NOT GO screw calliper gauge is used for checking
the simple pitch diameter of an external thread.
wear check blugs for plain GO calliper gauges.
3
---------------------- Page: 8 ----------------------
0 IS0
IS0 1502:1996(E)
plugs which belong either to the manufacturing
GO and NOT GO gauges are used for gauging the
plant (manufacturer) or to the inspector (pur-
major diameter of an external thread of a workpiece.
chaser) or, as far as screw plugs are concerned,
Whether a calliper or ring gauge is used is determined
by direct measurement.
by the form and rigidity of the workpiece. Plain ring
gauges should be used on non-rigid parts (see
The inspector uses his own gauges for gauging
b)
IS0 1938-I).
the workpiece threads.
5.2 Gauging of internal threads
In cases of dispute it is recommended that the
product be accepted if it is shown to be satisfac-
GO and NOT GO screw plug gauges are used for
tory by any gauge of the type concerned known
gauging internal threads of a workpiece; GO and NOT
to be within the requirements of this International
GO plain plug gauges are used for gauging the minor
Standard (taking into consideration the admissible
diamc I hter of a workpiece thread (see IS0 1938-l).
wea r).
c) The inspector uses his own inspection gauges for
53 . Inspection gauging
gauging the workpiece threads.
5.3.1 By the manufacturer
The position of the tolerance zone for these
gauges shall be such as to ensure that the pur-
In general, the inspection department that checks the
chaser does not reject threads whose actual size
threads made in a workshop may use the same kind
lies within the limits specified for the workpiece.
of gauges as are used in the workshop.
This International Standard does not specify which
Disagreement between manufacturing and inspection
gauges are to be used by the inspector; it only rec-
can occur when products close to the limits of sizes
ommends that the purchaser inform the manufacturer
are gauged.
when ordering what procedure will be employed for
the inspection of the workpiece threads. Worn
When disputes do arise, it is recommended that the
gauges shall not be used for sample inspection.
product be accepted if it is shown to be satisfactory
by any gauge of the type concerned known to be
6 Reference temperature
within the requirements of this International Standard
(taking into consideration the admissible wear).
In accordance with IS0 1, the dimensions of both the
In cases of dispute, checking of the ring gauges by gauge and the workpiece are related to a temperature
check plugs is decisive if there is no other agreement of 20 “C.
between the manufacturer and purchaser.
If the workpieces and gauges have the same coef-
The possibility of disputes can be reduced to a ficient of linear expansion (e.g. steel workpieces and
NOTE 1
minimum by grading the gauges so that those used by
steel gauges), the checking temperature may deviate
manufacturers provide a more stringent check than those
from 20 “C without detriment to the results, provided
used on inspection. Generally, this can be achieved by
that the temperatures of both gauges and workpieces
issuing to the workshops new or only slightly worn GO
are the same.
gauges and slightly worn NOT GO gauges. Inspection
should be made with GO gauges which are approaching the
If the workpieces and gauges have different co-
condition of maximum permissible wear and with new NOT
efficients of linear expansion [e.g. steel workpieces
GO gauges.
and carbide gauges or brass workpieces and gauges
of steel (or carbide)], the temperature of both shall be
5.32 By the purchaser
(20 + 2) “C at the time of gauging. Otherwise the
difference between the thermal expansions of the
There are three possible procedures, as listed below,
workpiece and the gauge shall be taken into consid-
for inspection of workpiece threads on behalf of the
eration.
purchaser by an inspector who does not belong to the
manufacturing plant concerned.
7 Function, checking and use of gauges
a) The inspector gauges the workpiece threads with
Throughout this clause, the designations of para-
the manufacturer’s gauges.
graphs are as follows:
In this case, the accuracy of the gauges used may
a) function;
be checked by means of check plugs and setting
4
---------------------- Page: 9 ----------------------
Q IS0 IS0 1502:1996(E)
7.1.2 Screw check plugs for new solid GO screw
b) control;
ring gauges
c) use.
a) GO and NOT GO screw check plugs are used to
NOTE 2 In the absence of b), there is no specification for
check the limits of the pitch diameter of a new
control.
solid GO screw ring gauge. A GO screw check
plug checks the GO limit of the total profile of a
new solid GO screw ring gauge.
7.1 Gauges for external threads of
c) The GO screw check plug, when screwed by
workpieces and their check plugs and setting
hand without using excessive force, shall pass
plugs
through the new solid GO screw ring gauge.
The NOT GO screw check plug, when screwed
7.1.1 Solid or adjustable GO screw ring gauges
by hand without using excessive force, may enter
into both ends of the new solid GO screw ring
a) A GO screw ring gauge checks the virtual size of
gauge, but by not more than one turn of
the external thread (gauging the virtual pitch di-
thread3).
ameter); i.e. it checks the maximum material limit
of the pitch diameter, taking into account devi-
7.1.3 Setting plugs for adjustable GO screw ring
ations of form and pitch errors and errors in flank
gauges
angles, which produce an apparent enlargement
of the pitch diameter (virtual pitch diameter) of
a) A setting plug which comprises two successive
the workpiece. In addition, this gauge checks
portions, one with complete flanks and the other
whether the length of the straight flank is ad-
with truncated flanks, is used to set an adjustable
equate; i.e. that the rounding at the root of the
GO screw ring gauge.
profile of the workpiece thread does not
encroach too far upon the flank of the thread. The
It is not essential to use a double-length setting
major diameter of the external thread is not
plug if the GO screw ring gauge is checked with
checked by this gauge.
a NOT GO screw check plug (see 7.1.2) after it
has been adjusted.
Checking with the GO screw ring gauge is es-
sentially in accordance with the Taylor principle
The GO screw ring gauge shall be set on the
b)
(see clause 1 I).
portion of the setting plug with complete flanks.
b) A solid GO screw ring gauge manufactured ac-
c) The portion of the setting plug with truncated
cording to the specified sizes shall be checked
flanks, when screwed by hand without using ex-
by GO and NOT GO screw check plugs and shall
cessive force, shall pass through the GO screw
be monitored regularly with a wear check plug.
nng gauge.
If a NOT GO screw check plug is not used, other
When the portion with truncated flanks of the
provisions (e.g. direct measurement) shall be
setting plug is screwed through the screw ring
made so as to ensure that the maximum permit-
gauge, there shall be no perceptible clearance
ted size of the pitch diameter of a new GO screw
between the plug and the ring. If there is a
ring gauge is not exceeded. Checking of ring
clearance, the ring gauge shall be lapped and ad-
gauges with check plugs is preferable to all other
justed in accordance with the manufacturer’s in-
forms of control.
structions to the correct form and size.
An adjustable GO screw ring gauge shall be set
7.1.4 Wear check plug for solid or adjustable GO
to its setting plug and shall be monitored regularly
screw ring gauges
with a wear check plug.
c) The GO screw ring gauge, when screwed by a) A wear check plug is used to ascertain that the
hand without using excessive force, shall pass wear limit of the pitch diameter of a GO screw
over the whole length of the workpiece thread. ring gauge has not exceeded the wear limit. It
embodies the pitch diameter of a GO screw ring
If assembly is not possible, the workpiece thread
gauge at the specified limit of wear.
does not comply with the specification.
3) The one turn of thread is determined when withdrawing the check plug.
---------------------- Page: 10 ----------------------
IS0 1502:1996(E) 0 IS0
c) The wear check plug, when screwed by hand a clearance, the anvils of the GO screw calliper
without using excessive force, may enter into gauge shall be adjusted.
both ends of the GO screw ring gauge, but by not
When put on the setting plug, the GO screw
more than one turn of thread3).
calliper gauge may be moved slightly to and fro
If the plug can be screwed in by more than one in a circumferential direction.
turn of thread, the GO screw ring gauge no
longer meets the specification.
7.1.7 NOT GO screw calliper gauges
7.1.5 GO screw calliper gauges
a) A NOT GO screw calliper gauge checks the
minimum limit of the pitch diameter. It operates
A GO screw calliper gauge checks the maximum
a)
very largely in accordance with the Taylor prin-
limit of the pitch diameter in an axial plane, as
ciple [see figure I Oa)].
apparently increased by errors of pitch and flank
b) The NOT GO screw calliper gauge shall be set
angle in the workpiece. Furthermore, it checks
with the setting plug specified.
whether the length of the straight flank is ad-
equate, for example that the rounding of the root
c) The NOT GO screw calliper gauge shall not pass
of the profile does not encroach too far upon the
over the workpiece except for the first two
flank of the thread. The major diameter of the
threads of the workpiece thread. The checking
external thread, however, is not checked.
shall be carried out under the same conditions of
presentation as the adjustment by means of the
With regard to the embodiment of the virtual
pitch diameter, a GO screw calliper gauge seri- setting plug; it shall take place in at least three
ously violates the Taylor principle (e.g. periodic positions, evenly distributed over the circumfer-
errors of pitch and deviations of form). ence.
If the gauge thread profile corresponds to
b) The GO screw calliper gauge shall be set with the
figure IO b), each gauging shall be repeated by
setting plug specified.
displacing the gauge axially by one thread pitch.
c) Workpiece threads are generally checked by the
GO screw calliper gauge under its own weight
7.1.8 Setting plugs for NOT GO screw calliper
or in accordance with a fixed working load to
gauges
correspond with the method of adjustment of the
gauge.
a) The NOT GO anvils of a screw calliper gauge shall
be set with a setting screw plug.
The GO screw calliper gauge shall accept the
workpiece thread at three positions at least,
c) The NOT GO screw calliper gauge shall pass over
evenly distributed over the whole circumference
the setting plug under its own weight or under a
of the thread. If the GO screw calliper gauge
fixed load. If the calliper will not pass over or if
cannot pass over the workpiece thread, than the
there is a clearance, the NOT GO screw calliper
workpiece thread does not comply with the
gauge anvils shall be adjusted.
specification.
When put on the setting plug, the NOT GO screw
When put on the workpiece, the GO screw
calliper gauge may be moved slightly to and fro
calliper gauge may be moved slightly to and fro
in a circumferential direction.
in a circumferential direction in order to minimize
the effects of friction.
7.1.9 Solid or adjustable NOT GO screw ring
In case s of d ispute, gauging with a GO screw ri gauges
w
prefe rably of the solid type 1, is decisive.
we,
w
a) A NOT GO screw ring gauge is intended to check
whether the actual pitch diameter of a workpiece
7.1.6 Setting plugs for GO screw calliper gauges
exceeds the specified minimum size. Checking
with a NOT GO screw ring gauge does not cor-
a) The GO anvils of a screw calliper gauge shall be
respond to the Taylor principle when checking
set with a setting screw plug.
rigid workpieces. In cases of non-rigid work-
c) The GO screw calliper gauge shall pass over the
pieces, departure from the Taylor principle is of
setting plug under its own weight or under a fixed less importance because of the flexibility of the
working load. If this is not possible or if there is workpieces.
---------------------- Page: 11 ----------------------
0 IS0
IS0 1502:1996(E)
b) NOT GO screw ring gauge to the specified pitch
A solid NOT GO screw ring gauge manufactured
according to the specified sizes shall be checked diameter.
by GO and NOT GO screw check plugs and shall
It is not essential to use a double-length setting
be monitored regularly with the wear check plug.
plug if the NOT GO screw ring gauge is checked
If a NOT GO check plug is not used, other pro- with a NOT GO screw check plug as described in
visions shall be made to ensure that the maxi-
7.1 .I 0 after the ring has been adjusted.
mum limit of the pitch diameter of a new NOT
b) The NOT GO screw ring gauge shall be set on the
GO screw ring gauge is not exceeded.
portion of the setting plug with complete flanks.
An adjustable NOT GO screw ring gauge shall be
c) The portion of the setting plug with complete
set with the setting plug specified and monitored
flanks, when screwed by hand without using ex-
regularly with a wear check plug.
cessive force, shall pass through a screw ring
c) A NOT GO screw ring gauge, when screwed by gauge.
hand without using excessive force on the work-
When the portion with truncated flanks of the
piece thread, may enter on both sides but by not
setting plug is screwed through the ring gauge,
more than two turns of thread4). If the gauge can
there shall be no perceptible clearance between
be screwed onto the workpiece by more than
the plug and the ring. If there is a clearance, the
two turns of thread, the thre
...
NORME IS0
INTERNATIONALE 1502
Deuxieme bdition
1996-02-o 1
Filetages mktriques IS0 pour usages
ghhraux - Calibres & limites et
verification
IS0 general-purpose metric screw threads - Gauges and gauging
Vumkro de rkfkrence
IS0 1502:1996(F)
---------------------- Page: 1 ----------------------
IS0 1502:1996(F)
Sommaire
Page
1
1 Domaine d ’application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
2 Rkfkrences normatives . . . . . . . . . . . . . . . . . . .
........................... 2
.............................. II ...
3 Symboles et abrhiations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Types de calibres
4.1 Calibres pour filetages exth-ieurs de pikes et leurs tampons
............................. 3
rapporteurs et tampons de rbf&ence .
4.2 Calibres pour filetages inthieurs de pikes . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 V&ification de pikes
.......... ............................... 3
5.1 V&ification de filetages exth-ieurs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.2 Wrification de filetages inthieurs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. 4
5.3 Rkception par calibrage
6 Tempitrature de rkfhence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 Fonction, vkification et emploi des calibres . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1 Calibres pour filetages extbrieurs de pikes et leurs tampons
. . . . . . . . . . . . . . . . . . . . . . . . .*. 5
rapporteurs et tampons de rkfi!rence . .
7.2 Calibres pour filetages intkrieurs de pi&es . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 Zones de tokrances pour le diamGtre sur flancs des calibres filet&
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
(voir figures 1 et 2)
9 Zones de tokrances pour calibres lisses (voir figures 3 et 4) 12
IO Profils des filetages de calibres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
10.1 Profils avec flancs complets (voir figures 5 et 6) . . . . . . . . . . . . . . . 14
IO.2 Profils avec flancs raccourcis (voir figures 7 et 8) . . . . . . . . . . . . . 17
IO.3 Deport de la piqOre pour le profil A flancs raccourcis . . . . . . . . 19
11 Caracthistiques g&kales des calibres filet& . 21
11 .I Calibres pour filetages extkieurs de pikes . 21
11.2 Calibres pour filetages interieurs de pi&es . . . . . . . . . . . . . . . . . . . . . . . 21
o IS0 1996
Droits de reproduction r&se&s. Sauf prescription diffkente, aucune partie de cette publi-
cation ne peut &re reproduite ni utilisee sous quelque forme que ce soit et par aucun pro-
&d& blectronique ou mkcanique, y compris la photocopie et les mlcrofilms, sans l ’accord
&-it de Mditeur.
Organisation internationale de normalisation
Case Postale 56 l CH-1211 Gerkve 20 l Suisse
lmprimb en Suisse
ii
---------------------- Page: 2 ----------------------
0 IS0 IS0 1502:1996(F)
11.3 Entree du filetage . . . 21
12 Tolerances et usure admissible pour les diametres sur flancs des
calibres (voir tableaux 4 a 9) . 23
13 Formules pour le calcul des limites de calibres . 25
13.1 Calibres filet& pour filetages exterieurs . 25
13.2 Calibres lisses pour les diametres exterieurs des filetages
exterieurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
13.3 Calibres filet& pour filetages interieurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
13.4 Calibres lisses pour les diametres interieurs des filetages
interieurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Annexe
A Bibliographie .
........................... 29
. . .
III
---------------------- Page: 3 ----------------------
0 is0
IS0 1502:1996(F)
Avant-propos
L ’ISO (Organisation internationale de normalisation) est une federation
mondiale d ’organismes nationaux de normalisation (comites membres de
I’ISO). L ’elaboration des Normes internationales est en general confiee aux
comites techniques de I’ISO. Chaque comite membre inter-es& par une
etude a le droit de faire partie du comite technique tree a cet effet. Les
organisations internationales, gouvernementales et non gouvernemen-
tales, en liaison avec I’ISO participent egalement aux travaux. L ’ISO colla-
bore etroitement avec la Commission electrotechnique internationale (CEI)
en ce qui concerne la normalisation electrotechnique.
Les projets de Normes internationales adopt& par les comites techniques
sont soumis aux comites membres pour vote. Leur publication comme
Normes internationales requiert I’approbation de 75 % au moins des co-
mites membres votants.
La Norme internationale IS0 1502 a ete elaboree par le comite technique
lSO/TC 1, filetages, sous-comite SC 4, V&ification.
Cette deuxieme edition annule et remplace la premiere edition
(IS0 1502:1978), dont elle constitue une revision technique.
L ’annexe A de la presente Norme internationale est donnee uniquement
a titre d ’information.
iv
---------------------- Page: 4 ----------------------
IS0 1502:1996(F)
NORME INTERNATIONALE 0 IS0
Filetages mbtriques IS0 pour usages gbnkraux -
Calibres & limites et verification
diametre sur flancs et le diametre virtue1 sur
1 Domaine d ’application
flancs) se trouvent a I’interieur des Iimites fixees.
La presente Norme internationale fournit les indica-
En vue de respecter ces deux principes, la presente
tions necessaires a la fabrication et a I’emploi de cali-
Norme internationale specific les types et les dimen-
bres pour le controle des filetages metriques IS0 pour
sions de calibres necessaires a la verification des
usages generaux dont le profil de base est conforme
filetages, les conditions d ’utilisation de ces calibres
il I’ISO 68.
et les regles applicables a I’inspection des filetages
de pieces.
Elle prescrit les caracteristiques essentielles des cali-
4.1 et 4.2 qui sont recommandes pour
bres list& en
le controle des pieces filetees interieurement et ex-
terieurement et pour l’ajustage et le controle de cer-
tains calibres filet&.
2 Rbfbrences normatives
D ’autres methodes de verification peuvent natu-
rellement etre adoptees, par exemple le mesurage au
Les normes suivantes contiennent des dispositions
moyen d ’appareils de mesure a lecture. La verification
qui, par suite de la reference qui en est faite, consti-
au moyen des calibres recommandes dans la pre- tuent des dispositions valables pour la presente
sente Norme internationale est cependant toujours Norme internationale. Au moment de la publication,
determinante. les editions indiquees etaient en vigueur. Toute
norme est sujette a revision et les parties prenantes
La presente Norme internationale fournit les moyens des accords fond& sur la presente Norme internatio-
propres a differencier les filetages restant dans les
nale sont invitees a rechercher la possibilite d ’appli-
Iimites de tolerances de ceux qui se situent hors de
quer les editions les plus recentes des normes
ces Iimites. indiquees ci-apres. Les membres de la CEI et de I’ISO
possedent le registre des Normes internationales en
Dans le but d ’assurer I’interchangeabiliti des filetages
vigueur a un moment donne.
de pieces et pour eviter tout litige entre le fabricant
et l’acheteur, il convient d ’observer les principes sui- IS0 1 :I 975, Temphature normale de kfkrence des
mesures industrielles de longueur.
vants:
IS0 68: -I), Filetages IS0 pour usages g&Graux -
a) que le fabricant ne fournisse aucune piece dont
les dimensions effectives de filetage (par exemple Profil de base.
le diametre sur flancs et le diametre virtue1 sur
IS0 1938-l : -*I, Vhification des pikes lisses - Par-
flancs) se trouvent hors des limites fixees;
tie 7: Calibres P limites, lisses (Avec /es Normes IS0
b) que I’acheteur ne refuse aucune piece dont les 7938-2 et IS0 7938-3, hision de /‘/SO/R
dimensions effectives de filetage (par exemple le 7938: 1971).
1) A publier. (Rbvision de I ’ISO 68:1973)
2) k publier.
1
---------------------- Page: 5 ----------------------
0 IS0
IS0 1502:1996(F)
prksente Norme internationale sont i3num&-6s dans le
3 Symboles et abrhiations
tableau 1.
Les symboles et abrhiations mentionnhs dans la
Tableau 1 - Symboles et abrhiations
Symbole
Symbole
Dbfinition ou Dbfinition
ou
abrhiation
abrhiation
Largeur de la piqure au diametre exterieur du Rayon de la piqljre de fond de profil des bagues
filetees ENTRE et N ’ENTRE PAS ou des
profil du calibre avec flancs complets
calibres-machoires filet& ENTRE et N ’ENTRE
Largeur de la piqljre au diametre interieur du
PAS
profil du calibre avec flancs complets
Deport de la piqljre avec flancs raccourcis
S
Largeur de la piqure au diametre exterieur et
interteur, respectivement du profil du calibre
Tolerance sur chaque inclinaison de flanc des
To,, 12
avec flancs raccourcis
profils avec flancs complets
Diametre exterieur de base du filetage de la
Tolerance sur chaque inclinaison de flanc des
C2l2
d, D
piece
profils avec flancs raccourcis
Diametre interieur de base du filetage interieur
Tolerance pour le diametre sur flancs de tam-
CP
4
de la piece
pons rapporteurs ENTRE et N ’ENTRE PAS, et
de temorns d ’usure et tampons de reference
Diametre sur flancs de base du filetage de la
4 D2
piece
Tolerance pour le diametre exterieur du filetage
exterieur de la piece
kart fondamental du filetage exterieur de la
es
piece (pour la position de tolerance h, l ’ecart
Tolerance pour le diametre sur flancs du filetage
T
d2
fondamental es est egal a zero)
exterieur de la piece
kart fondamental du filetage interieur de la
EI Tolerance pour le diametre interieur du filetage
T
Dl
piece (pour la position de tolerance H, I ’ecart
interieur de la piece
fondamental El est egal a zero)
Tolerance pour le diametre sur flancs du filetage
T
02
Pour les profils avec flancs raccourcis, distance
interieur de la piece
Fl
radiale entre la ligne primitive et la fin de la par-
Tolerance pour le pas du filetage de calibre
tie droite du flanc en direction du sommet TP
Tolerance pour le diametre sur flancs de tam-
Pour les profils avec flancs raccourcis, distance
TPL
pons filet& ENTRE et N ’ENTRE PAS
radiale entre la ligne primitive et la fin de la par-
tie droite du flanc en direction du fond
Tolerance pour le diametre sur flancs de bagues
filetees ENTRE et N ’ENTRE PAS
Hauteur du triangle du profil du filetage
H
Valeur moyenne representant I ’usure admissible
Tolerance sur le diametre pour tampons lisses wGO
4
du tampon filete ENTRE et de la bague filetee
Tolerance pour calibres-machoires lisses et ENTRE
H2
bagues lisses
Valeur moyenne representant l ’usure admissible
WNG
Tolerance pour tampons rapporteurs pour du tampon filete N ’ENTRE PAS et de la bague
HP
calibres-machoires lisses filetee N ’ENTRE PAS
Limite au minimum de mat&e Distance du centre de la zone de tolerance if,
LML
du tampon ENTRE a la Iimite inferieure du dia-
Distance entre le centre des zones de tolerance
nz
metre interieur de la piece
TR de la bague filetee et Tcp du tampon rappor-
Distance du centre de la zone de tolerance tf,
teur ENTRE
22
du calibre-machoire ENTRE, ou de la bague
Limite au maximum de matiere
MML
ENTRE, a la Iimite superieure du diametre ex-
terieur de la piece
Pas
P
Distance du centre de la zone de tolerance &,
ZPL
Rayon de la piqljre de fond de profil des tam-
?
du tampon filete ENTRE a la tote Iimite infe-
pons filet& ENTRE et N ’ENTRE PAS
rieure du filetage de la piece
Distance du centre de la zone de tolerance r,
de la bague filetee ENTRE a la tote Iimite su-
perieure du filetage de la piece
2
---------------------- Page: 6 ----------------------
0 IS0
IS0 1502:1996(F)
- temoin d ’usure pour calibre-machoires lisse
4 Types de calibres
ENTRE.
4.2 Calibres pour filetages intkrieurs de
4.1 Calibres pour filetages extkrieurs de
pikes
pikes et leurs tampons rapporteurs et
tampons de r6fhence
Les types suivants sont recommandes:
Les types suivants sont recommandes:
- tampon filete ENTRE;
- bague filetee ENTRE fixe;
- tampon filete N ’ENTRE PAS;
- bague filetee ENTRE reglable;
- tampon lisse ENTRE;
- tampons rapporteurs ENTRE et N ’ENTRE PAS
- tampon lisse N ’ENTRE PAS.
pour bague filetee ENTRE fixe, neuve;
- tampon de reference pour bague filetee ENTRE
5 Vkification de pikes
regla ble;
II n ’est pas necessaire d ’utiliser, a I ’atelier ou au de-
- temoin d ’usure pour bague filetee ENTRE fixe ou partement de controle, tous les calibres mentionnes
reglable; a I ’article 3. Toutefois, pour la verification des Iimites
(controle du respect des tolerances), il est necessaire
- calibre-machoires filete ENTRE;
d ’effectuer une verification ENTRE avec l ’un des cali-
bres ENTRE et une verification N ’ENTRE PAS avec
tampon de reference pour calibre-machoires filete
I ’un des calibres N ’ENTRE PAS, mentionnes en 4.1
ENTRE;
et 4.2.
calibre-machoires filete N ’ENTRE PAS;
5.1 Vkification de filetages extkrieurs
tampon de reference pour calibre-machoires filete
II convient d ’utiliser, de preference, une bague filetee
N ’ENTRE PAS;
ENTRE, fixe ou reglable, pour verifier un filetage ex-
terieur.
bague filetee N ’ENTRE PAS fixe;
En vue de reduire le temps consacre au controle ou
bague filetee N ’ENTRE PAS reglable;
lorsque la bague filetee ENTRE ne peut etre utilisee,
il est possible de se servir d ’un calibre-machoires fi-
tampons rapporteurs ENTRE et N ’ENTRE PAS
lete ENTRE.
pour bague filetee N ’ENTRE PAS fixe, neuve;
Toutefois, il est recommande de completer une veri-
tampon de reference pour bague filetee N ’ENTRE
fication effect&e au moyen de calibres-machoires fi-
PAS reglable;
let& ENTRE par un prelevement d ’echantillons au
hasard au moyen de la bague filetee ENTRE, afin que,
temoin d ’usure pour bague filetee N ’ENTRE PAS
lorsqu ’un grand nombre de pieces sont controlees au
fixe ou reglable;
moyen d ’un calibre-machoires filete ENTRE, un cer-
tain pourcentage soit soumis a un controle additionnel
bague lisse ENTRE;
au moyen d ’une bague filetee ENTRE; cette precau-
tion permettra de mieux assurer I ’interchangeabilite
- calibre-machoires lisse ENTRE;
des filetages de pieces.
- calibre-machoires lisse N ’ENTRE PAS;
II convient de ne pas utiliser un calibre-machoires fi-
lete ENTRE si le procede de fabrication entraTne, dans
- bague lisse N ’ENTRE PAS;
le filetage de la piece, des imperfections que ce cali-
- tampon rapporteur pour calibre-machoires lisse bre ne peut deceler avec certitude, par exemple: irre-
gularites locales de pas pour les filetages frarses ou
ENTRE neuf;
bavures a I ’entree du filetage. De plus, un calibre-
- tampon rapporteur pour calibre-machoires lisse machoires filete ENTRE ne convient pas 2 la verifica-
N ’ENTRE PAS neuf; tion de pieces non rigides, par exemple a paroi mince,
---------------------- Page: 7 ----------------------
@3 IS0
IS0 1502:1996(F)
defaut d ’accord y relatif entre le fabricant et I’ache-
susceptibles d ’etre deformees par ce calibre. Dans de
teur.
tels cas, il est recommande que la verification s ’ef-
fectue au moyen d ’une bague filetee ENTRE.
NOTE 1 Les possibilit6s de litiges peuvent etre reduites
au minimum par une rbpartition des calibres telle que ceux
De meme, il est recommande d ’utiliser une bague fi-
de la fabrication permettant une vkrification plus serrke que
letee N ’ENTRE PAS, fixe ou reglable, seulement pour
ceux utilisks au contr6le. G&+ralement, ce but peut &re
des pieces non rigides, par exemple a paroi mince,
atteint en dklivrant h la fabrication des calibres ENTRE neufs
susceptibles d ’etre deformees lors de la verification
ou seulement leg&-ement us& et des calibres N ’ENTRE
au moyen d ’un calibre-machoires filete N ’ENTRE PAS.
PAS peu us&. II convient que le contr6le utilise des calibres
ENTRE s ’approchant de la condition du maximum d ’usure
Un calibre-machoires file% N ’ENTRE PAS est utilise
admissible et des calibres N ’ENTRE PAS 5 Mat neuf.
pour verifier le diametre mesure sur flancs du filetage
exterieur.
5.3.2 Par I’acheteur
Un calibre-machoires filete N ’ENTRE PAS est utilise
II existe trois possibilites d ’inspection des filetages de
pour verifier le diametre mesure sur flancs du filetage
pieces, pour le compte de I’acheteur, par un inspec-
exterieur.
teur n ’appartenant pas a I’etablissement de fabrica-
tion:
Pour la verification du diametre exterieur du filetage
exterieur de la piece, il convient d ’utiliser des calibres
a) Pour la verification des filetages de pieces, I’ins-
ENTRE et N ’ENTRE PAS. La forme et la rigidite de la
pecteur utilise les calibres du fabricant.
piece determinent le choix entre le calibre-machoires
ou la bague. II convient que des bagues lisses soient
Dans ce cas, I’inspecteur peut verifier I’exactitude
utilisees pour les pieces non rigides (voir IS0 1938-l).
des calibres utilises au moyen de tampons rap-
porteurs et de tampons de reference appartenant
soit a I’etablissement de fabrication (fabricant),
5.2 Vkification de filetages inthrieurs
soit a I’inspecteur (acheteur) ou, en ce qui
concerne les tampons filet&, par mesurage di-
Pour la verification du filetage interieur de la piece, les
rect.
tampons filet& ENTRE et N ’ENTRE PAS doivent etre
utilises.
b) L ’inspecteur utilise ses propres calibres pour la
verification des filetages de pieces.
Pour la verification du diametre interieur du filetage
interieur de la piece, les tampons lisses ENTRE et
En cas de litige, il est recommande d ’accepter la
N ’ENTRE PAS doivent etre utilises (voir IS0 1938-I).
piece si elle est trouvee satisfaisante par un cali-
bre quelconque du type adequat, reconnu
5.3 Rhception par calibrage
conforme aux specifications de la presente Norme
internationale (compte tenu de l’usure admissi-
ble) .
5.3.1 Par le fabricant
c) L ’inspecteur utilise ses propres calibres d ’inspec-
Le departement de controle qui verifie les filetages
tion pour la verification des filetages de pieces.
usines dans I’atelier peut, en principe, utiliser des ca-
Iibres de meme type que ceux de l’atelier.
La position de la zone de tolerances pour ces ca-
Iibres doit donner toute assurance que le client ne
Des litiges entre la fabrication et le controle peuvent
refuse aucune piece dont les dimensions effec-
s ’elever lors de la verification, au moyen de calibres,
tives de filetage se trouvent dans les Iimites spe-
de pieces sit&es aux limites de tolerances.
cifiees pour la piece.
En cas de litige, il est recommande d ’accepter la piece
La presente Norme internationale ne specific pas les
si elle est trouvee satisfaisante par un calibre quel-
calibres devant etre utilises par I’inspecteur; elle re-
conque du type adequat, reconnu conforme aux spe-
commande seulement que I’acheteur communique au
cifications de la presente Norme internationale
fabricant lors de la commande, quel procede sera
(compte tenu de l’usure admissible).
adopte pour I’inspection des filetages de pieces. Des
En cas de litige, la verification des bagues filetees au calibres uses ne doivent pas etre utilises pour le
moyen des tampons rapporteurs est determinante, a controle par echantillon.
4
---------------------- Page: 8 ----------------------
0 IS0 IS0 1502:1996(F)
Cette bague ne verifie pas le diametre exterieur
6 Tempbrature de rbf&ence
du filetage exterieur.
Les dimensions des calibres et des pieces doivent se
Une bague filetee ENTRE verifie essentiellement
referer a une temperature de 20 “C, conformement a
selon le principe de Taylor (voir article 1 I).
I ’ISO 1.
b) Une bague filetee ENTRE fixe, fabriquee selon
Si les pieces et les calibres ont le meme coefficient
les dimensions prescrites, doit etre verifiee par
de dilatation (par exemple pieces en acier et calibres
les tampons rapporteurs filet& ENTRE et N ’EN-
en acier), la temperature de verification peut sans
TRE PAS et controlee regulierement par le te-
danger s ’ecarter de 20 “C, a condition que les pieces
moin d ’usure.
et les calibres utilises aient la meme temperature.
Si un tampon rapporteur filete N ’ENTRE PAS
Si les pieces et les calibres ont un coefficient de dila-
n ’est pas utilise, d ’autres mesures doivent etre
tation different (par exemple pieces en acier et cali-
prises pour s ’assurer que la dimension maximale
bres en carbure ou pieces en laiton et calibres en acier
du diametre sur flancs de la bague neuve filetee
ou en carbure), la temperature des pieces et des cali-
ENTRE n ’est pas depassee (par exemple le me-
bres doit etre de (20 + 2) “C lors du controle. Si tel
surage direct). Le controle des bagues par tam-
n ’est pas le cas, il est alors necessaire de tenir
pon rapporteur est preferable a toute autre
compte de la difference de dilatation thermique de la
methode.
piece et du calibre.
Une bague filetee ENTRE reglable doit etre ajus-
tee au moyen du tampon de reference et doit
7 Fonction, vhification et emploi des
etre controlee regulierement par le temoin
calibres
d ’usure.
Dans cet article, les designations des paragraphes ont
c) La bague filetee ENTRE doit pouvoir, sans forcer
les significations suivantes:
particulierement, se visser a la main sur toute la
longueur du filetage de la piece. Si tel n ’est pas
a) fonction;
le cas, le filetage de la piece ne repond pas aux
prescriptions.
b) verification;
7.1.2 Tampons rapporteurs pour bague filetbe
c) emploi.
ENTRE fixe, neuve
NOTE 2 En l ’absence de paragraphe b), il n ’y a pas de
spitcification pour la vkrification.
Les tampons rapporteurs ENTRE et N ’ENTRE
PAS sont utilises pour la verification des dimen-
sions limites du diametre sur flancs de la bague
7.1 Calibres pour filetages extkrieurs de
filetee ENTRE fixe, neuve. En outre, le tampon
pi&es et leurs tampons rapporteurs et
rapporteur ENTRE verifie la limite ENTRE du profil
tampons de rbfkence
total de la bague filetee ENTRE fixe, neuve, ap-
propriee.
7.1.1 Bague filetee ENTRE fixe ou rkglable
Le rapporteur ENTRE doit pouvoir, sans forcer
particulierement, se visser a la main a travers la
a) Une bague filetee ENTRE verifie la dimension
bague filetee ENTRE fixe, neuve.
virtue//e du filetage exterieur du c&e ENTRE (ve-
rification du diametre virtue1 sur flancs), c ’est-a-
Le rapporteur N ’ENTRE PAS ne doit pas pouvoir,
dire qu ’elle controle la dimension maximale de
sans forcer particulierement, se visser a la main
mat&e du diametre sur flancs, y compris les
ni d ’un cote ni de I ’autre de la bague filetee
&arts de forme et les erreurs de pas, et d ’incli-
ENTRE fixe, neuve, de plus d ’un seul tour3).
naison de flancs. Ces erreurs provoquent un
agrandissement apparent du diametre sur flancs
(diametre virtue1 sur flancs) de la piece. Cette
7.1.3 Tampon de rbfkence pour bague filetke
bague verifie, de plus, si la partie droite de flanc
ENTRE kglable
est assez longue, c ’est-a-dire si I ’arrondi a fond
de filet n ’empiete pas trop sur le flanc du profil. a) Un tampon de reference contient deux parties
3) Le nombre de tours est dktermink lors du dhissage du tampon
5
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0 IS0
IS0 1502:1996(F)
En ce qui concerne le diametre virtue1 sur flancs,
successives, l’une avec flancs complets et I’autre
le calibre-machoires filete ENTRE s ’eloigne
avec flancs raccourcis; il est utilise pour I’ajustage
considerablement du principe de Taylor (par
de la bague filetee ENTRE reglable au diametre
exemple les erreurs de pas periodiques et les
sur flancs prescrit.
erreurs de forme ne sont pas d&ekes).
II nest pas essentiel d ’utiliser un tampon de re-
b) Le calibre-machoires filete ENTRE doit etre ajuste
ference avec une longueur double si la bague fi-
a I’aide du tampon de reference specific.
letee ENTRE est verifiee avec un tampon
rapporteur N ’ENTRE PAS (voir 7.1.2) apres avoir
c) En general, les filetages de pieces sont verifies
ete ajustee.
par calibre-machoires filete ENTRE, sous son
propre poids ou sous une charge d ’emploi indi-
b) Le reglage de la bague filetee ENTRE doit se faire
quee, pour correspondre a la methode d ’ajus-
sur la partie du tampon de reference ayant des
tement du calibre.
flancs complets.
Le calibre-machoires filete ENTRE doit accepter
c) La partie du tampon de reference avec flancs
raccourcis doit pouvoir, sans forcer particu- le filetage de piece au moins en trois endroits
lierement, se visser a la main a travers la bague egalement repartis sur la circonference du filet-
filetee ENTRE. age. Si le calibre-machoires filete ENTRE ne peut
pas passer sur la piece, le filetage de piece ne
Lorsque la partie du tampon de reference pre-
repond pas aux prescriptions.
sentant des flancs raccourcis est vissee dans la
bague filetee, aucun jeu perceptible ne doit exis- Une fois pose sur la piece, le calibre-machoires
ter entre le tampon de reference et la bague file- filete ENTRE peut recevoir un leger mouvement
tee. En cas de jeu, la bague filetee doit etre rodee d ’oscillation circulaire en vue de reduire les effets
et ajustee a une forme et une dimension correc-
de frottement.
tes conformement aux instructions du fabricant.
En cas de litige, la verification avec la bague file-
tee ENTRE, de preference du type fixe, est de-
7.1.4 Temoin d ’usure pour bague filethe ENTRE
terminante.
fixe ou rbglable
a) Ce temoin d ’usure sert a verifier si le diametre
7.1.6 Tampon de r6f6rence pour
sur flancs des bagues filetees ENTRE n ’a pas
calibre-mgchoires filet6 ENTRE
depasse la Iimite d ’usure. II represente done le
diametre sur flancs de la bague filetee ENTRE a
a) Ce tampon de reference sert a I’ajustage des
la Iimite d ’usure prescrite.
touches du calibre-machoires ENTRE.
c) Le temoin d ’usure ne doit pas pouvoir, sans for-
c) Le calibre-machoires filete ENTRE doit passer sur
cer particulierement, se visser a la main ni d ’un
le tampon de reference sous I’action de son pro-
tote ni de I’autre de la bague filetee ENTRE, de
pre poids ou d ’un charge d ’emploi determinee.
plus d ’un seul tour3).
Si tel n ’est pas le cas, ou s ’il y a du jeu, les tou-
ches du calibre-machoires filete ENTRE doivent
Si le temoin se visse de plus d ’un seul tour, la
etre reajustees.
bague filetee ENTRE ne repond plus aux pres-
criptions.
Le calibre-machoires filete ENTRE peut recevoir
un leger mouvement d ’oscillation une fois place
7.1.5 Calibre-mkhoires filet6 ENTRE
sur le tampon de reference.
a) Un calibre-machoire filete ENTRE verifie la di-
mension maximale du diametre sur flancs dans
7.1.7 Calibre-mkhoires filet6 N ’ENTRE PAS
un plan axial, ou des erreurs de pas et d ’inclinai-
son de flancs de la piece provoquent un agran-
a) Ce calibre verifie la dimension minimale du dia-
dissement apparent de son diametre sur flancs.
metre sur flancs. II agit essentiellement suivant
De plus, il verifie si la partie droite du flanc est
le principe de Taylor [voir figure IOa)].
assez longue, c ’est-a-dire si I’arrondi a fond de fi-
let n ’empiete pas trop sur le flanc du profil. Le b) Le calibre-machoires filete N ’ENTRE PAS doit
diametre exterieur du filetage exterieur n ’est ce- etre ajuste a I’aide du tampon de reference spe-
pendant pas verifie. cifie.
6
---------------------- Page: 10 ----------------------
0 IS0 IS0 1502:1996(F)
c) Le calibre-machoires filete N ’ENTRE PAS ne doit Une bague filetee N ’ENTRE PAS reglable doit
pas passer sur la piece, exception faite des deux etre ajustee a I ’aide du tampon de reference et
controlee regulierement par le temoin d ’usure.
premiers filets de la piece. Lors de la verification,
il faut respecter les memes conditions que pour
Une bague filetee N ’ENTRE PAS ne doit pas
d
l ’ajustage au moyen du tampon de reference. Elle
pouvoir, sans forcer particulierement, se visser a
doit etre effect&e au moins en trois endroits,
la main sur le filetage de la piece ni d ’un tote ni
egalement repartis sur la circonference.
de I ’autre de plus de deux tours4! Si elle peut etre
vissee sur la piece de plus de deux tours, le
Si le calibre correspond a la figure 10 b), chaque
filetage ne repond pas aux prescriptions. La ba-
verification doit etre repetee en deplacant le cali-
gue filetee N ’ENTRE PAS ne doit pas passer
bre d ’un pas a I ’autre.
completement sur une piece ayant une longueur
de filetage de trois filets ou moins.
7.1.8 Tampon de rkfbrence pour
calibre-mkhoires filet6 N ’ENTRE PAS 7.1.10 Tampons rapporteurs pour bague filetbe
N ’ENTRE PAS fixe, neuve
a) Ce tampon de reference sert a I ’ajustage des
touches du calibre-machoires N ’ENTRE PAS. a) Les tampons rapporteurs ENTRE et N ’ENTRE
PAS sont utilises pour la verification des dimen-
c) Le calibre-machoires filete N ’ENTRE PAS doit
sio
...
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