SIST ISO 228-2:2001

Pipe threads where pressure-tight joints are not made on the threads -- Part 2: Verification by means of limit gauges

This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.

Filetages de tuyauterie pour raccordement sans étanchéité dans le filet -- Partie 2: Vérification par calibres à limites

Cevni navoji za zveze, ki ne tesnijo z navoji – 2. del: Kontrola s kalibri

General Information

• Status: Withdrawn
• Publication Date: 31-Aug-2001
• Withdrawal Date: 27-Mar-2012
• ICS: 21.040.30 - Special screw threads
• Technical Committee: TLP - Pressure vessels
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 27-Mar-2012
• Due Date: 19-Apr-2012
• Completion Date: 28-Mar-2012
• Ref Project: ISO 228-2:1987 - Pipe threads where pressure-tight joints are not made on the threads

RELATIONS

• Replaced By: SIST EN ISO 228-2:2003 - Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987)
• Effective Date: 01-May-2012

Standards Content (sample)

IS0
INTERNATIONAL STANDARD
228-2
Second edition
1987-08-H
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXflYHAPOflHAR OPrAHM3A~Mfl l-l0 CTAHflAPTM3A~MM
Pipe threads where pressure-tight joints are not made
on the threads -
Part 2 :
Verification by means of limit gauges
Filetages de tu yauterie pour raccordemen t sans &ancMit& dans le filet -
Partie 2 : Wrification par calibres 5 limites
Reference number
IS0 228-2 : 1987 (E)
---------------------- Page: 1 ----------------------
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, govern-

mental and non-governmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the technical committees are circulated to

the member bodies for approval before their acceptance as International Standards by

the IS0 Council. They are approved in accordance with IS0 procedures requiring at

least 75 % approval by the member bodies voting.
International Standard IS0 228-2 was prepared by Technical Committee ISO/TC 5,
Ferrous metal pipes and metallic fittings.

This second edition cancels and replaces the first edition (IS0 228-2 : 19801, of which it

constitutes a minor revision.

Users should note that all International Standards undergo revision from time to time

and that any reference made herein to any other International Standard implies its

latest edition, unless otherwise stated.
0 International Organization for Standardization, 1987
Printed in Switzerland
---------------------- Page: 2 ----------------------
IS0 228-2 : 1987 (E)
INTERNATIONAL STANDARD
Pipe threads where pressure-tight joints are not made on
the threads -
Part 2 I
Verification by means of limit gauges
Table 1
1 Scope and field of application
Symbol Explanation
This part of IS0 228 specifies the verification, by means of limit
gauges, of cylindrical threads, the dimensions and tolerances
Width of clearance groove at the major and minor

of which are given in IS0 228-l. diameter respectively of the thread profile with trun-

cated flanks
For industrial applications (see for example IS0 1179), it may be
d= D 1 Basic major diameter of the thread
necessary to carry out additional checks.
- 1,280 654 P : Basic minor diameter of the
1 d’ = D1 1 iredad
Since this 55O profile has different elements to be verified, it is
- d - 0,646 327 P : Basic pitch diameter of the
necessary to provide for several GO and several NOT GO
1 d2 = D2 1 thread
gauges :
m Distance between the middle of the tolerance zones
TR of the threaded ring gauge and TcP of the GO
a) the threaded GO gauges (see clauses 6 and 7) shall en-
check plug
sure that the profile of the machined piece does not exceed
Nominal value of b3
the maximum of material provided for by the tolerances ap- I I
plied to the dimensions of the profile defined by IS0 228-l;
P Pitch
I I I
Displacement of the clearance groove with trun-
b) the threaded NOT GO gauges for the threads of the
1 ’ ( cated flanks
pieces (see clauses 6 and 7) fix the minimum material limit
S Tolerance on b3
on the flanks of the thread. I I I
Tolerance on the pitch diameter of GO and NOT GO
threaded check plugs and wear check plugs
Reference checks may be carried out in specialized
NOTE -
laboratories.
Tolerance on the pitch diameter of the external
I Td2 I thread
Tolerance on the pitch diameter of the internal
1 TD2 1 thread
2 References
Tolerance on the pitch diameter of GO and NOT GO
threaded plug gauges
I TpL I
IS0 228-1, Pipe threads where pressure- tight joints are not
Tolerance on the pitch diameter of GO and NOT GO
made on the threads - Part I : Designation, dimensions and
threaded ring gauges
I TR I I
tolerances.
= 0,147 84 P : Twice the radial height of rounding
at crest and root of thread
I u I I
IS0 1179, Pipe connections, threaded to IS0 228- 7, for plain
Average amount available for the permissible wear
end steel and other metal tubes in industrial applications.
wGO
of GO threaded plug gauge and GO threaded ring
WJW
IS0 1502, IS0 general purpose metric screw threads -
Gauging. Average amount available for the permissible wear
WNG
of NOT GO threaded plug gauge and NOT GO
threaded ring gauge
Distance between the middle of the tolerance zone
ZPL
TPL of the GO threaded plug gauge and the lower
3 Symbols and explanations
limit of the thread
Distance between the middle of the tolerance zone
The symbols used in this part of IS0 228 are the same as those
TR of the GO threaded ring gauge and the upper
used in IS0 1502 for the IS0 thread gauges, plus some addi-
limit of the thread
tional symbols (n, S, u), as shown in table 1.
---------------------- Page: 3 ----------------------
IS0 228-2 : 1987 (E)
4.1.2.2 Use
4 Function, control and use of gauges
The threaded GO check plug screwed by hand, without ex-
4.1 Gauges for external threads and their check
cessive force, shall pass through the new solid threaded GO
ring gauge.
plugs
The threaded NOT GO check plug screwed by hand, without
4.1.1 Solid GO threaded ring gauge
excessive force, may enter into both ends of the new solid
threaded GO ring gauge, but not more than one turn of
thread. l)
4.1.1.1 Function
Wear check plug for solid threaded GO ring gauge
The threaded GO ring gauge checks the virtual size of the exter- 4.1.3
nal thread on the GO side (gauging the virtual pitch diameter),
i.e. it checks the maximum material limit of the pitch diameter,
4.1.3.1 Function
taking into account deviations of form (departures from round-
ness and lack of straightness of the thread axis over the gauge
The wear check plug is used to ascertain that the pitch diameter
length) and pitch errors, helix variations and errors in the flank
of the threaded GO ring gauge has not exceeded the wear limit.
angles, which produce an apparent enlargement of the pitch
It embodies the pitch diameter of the threaded GO ring gauge
diameter (virtual pitch diameter). In addition, this gauge checks
at the prescribed limit of wear.
whether the length of the straight flank is adequate, i.e. that
the rounding at the root of the profile does not encroach too far
4.1.3.2 Use
upon the flank of the thread.
The wear check plug screwed by hand, without excessive
This gauge shows the maximum material limit.
force, may enter into both ends of the threaded GO ring gauge,
but not more than one turn of thread?
Checking with the threaded GO ring gauge is essentially in ac-
cordance with the Taylor principle (see IS0 1502 : 1978, sub-
If it can be screwed in more than one turn of thread, the thread-
clause 7.1.1).
ed GO ring gauge no longer meets the specifications.
4.1.4 Solid threaded NOT GO ring gauge
4.1.1.2 Control
The solid threaded GO ring gauge manufactured according to
4.1.4.1 Function
the prescribed sizes shall be checked using the threaded GO
and NOT GO check plugs and should be controlled regularly
The threaded NOT GO ring gauge is intended to check whether
with the wear check plug.
the actual pitch diameter exceeds the specified minimum size.
The checking with the threaded NOT GO ring gauge does not
correspond to the Taylor principle when checking rigid machin-
If the NOT GO check plug is not used, other provisions shall be
ed pieces. In cases of non-rigid machined pieces, the departure
made so as to ensure that the maximum size of the pitch
from the Taylor principle is of less importance because of the
diameter of the threaded GO ring gauge is not exceeded.
flexibility of the pieces.
4.1.1.3 Use
4.1.4.2 Control
The threaded GO ring gauge screwed by hand, without ex-
The solid threaded NOT GO ring gauge manufactured accord-
cessive force, shall pass over the whole length of the thread. If
ing to the prescribed sizes shall be checked using the threaded
this is not possible, the thread does not comply with the
GO and NOT GO check plugs and should be controlled regular-
specifications.
ly with the wear check plug.
If the NOT GO check plug is not used, other provisions shall be
4.1.2 Threaded check plugs for new solid threaded GO
made to ensure that the maximum limit of the pitch diameter of
ring gauge
the new threaded NOT GO ring gauge is not exceeded.
4.1.2.1 Function
4.1.4.3 Use
The threaded NOT GO ring gauge, screwed by hand without
These threaded check plugs (GO and NOT GO) are used to

check the limits of the pitch diameter of the new solid threaded excessive force onto the thread, may be screwed on both sides

but not more than two turns of thread?
GO ring gauge.

1) The number of turns of thread is determined when unscrewing the plug or ring gauge.

---------------------- Page: 4 ----------------------
IS0 228-2 :I987 (E)
than two turns , the
If the gauge can be screwed more 4.2 Gauges for internal threads
comply with the specifications.
thread does not
4.2.1 Threaded GO plug gauge
gauge shall not pass completely
The threaded NOT GO ring
a threaded part having a length of three threads or less.
over
4.2.1.1 Function
The threaded GO plug gauge checks the virtual size of the inter-
4.1.5 Threaded check plugs for new solid threaded
nal thread on the GO side (gauging the virtual pitch diameter).
NOT GO ring gauge
This is effected by checking the minimum limit of the pitch
diameter, taking into account pitch errors, errors in the flank

4.1.5.1 Function angles, helix variations and deviations of form (departures from

roundness and lack of straightness of the thread axis over the
gauge length) which produce an apparent reduction of the
The check plugs (GO and NOT GO) are used to check the pitch
pitch diameter (virtual pitch diameter). In addition, it checks the
diameter limits of the new solid threaded NOT GO ring gauge.
minimum limit of the major diameter and also whether the
The threaded GO check plug makes sure that the clearance
length of straight flank is sufficient, i.e. that the rounding at the
diameter of the new solid threaded NOT GO ring gauge is not
root of the profile does not encroach too far upon the flank of
too small.
the thread.
If a wear check plug for the threaded NOT GO ring gauge is
...

SLOVENSKI STANDARD
SIST ISO 228-2:2001
01-september-2001
Cevni navoji za zveze, ki ne tesnijo z navoji – 2. del: Kontrola s kalibri
Pipe threads where pressure-tight joints are not made on the threads -- Part 2:
Verification by means of limit gauges

Filetages de tuyauterie pour raccordement sans étanchéité dans le filet -- Partie 2:

Vérification par calibres à limites
Ta slovenski standard je istoveten z: ISO 228-2:1987
ICS:
21.040.30 Posebni navoji Special screw threads
SIST ISO 228-2:2001 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 228-2:2001
---------------------- Page: 2 ----------------------
SIST ISO 228-2:2001
IS0
INTERNATIONAL STANDARD
228-2
Second edition
1987-08-H
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXflYHAPOflHAR OPrAHM3A~Mfl l-l0 CTAHflAPTM3A~MM
Pipe threads where pressure-tight joints are not made
on the threads -
Part 2 :
Verification by means of limit gauges
Filetages de tu yauterie pour raccordemen t sans &ancMit& dans le filet -
Partie 2 : Wrification par calibres 5 limites
Reference number
IS0 228-2 : 1987 (E)
---------------------- Page: 3 ----------------------
SIST ISO 228-2:2001
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, govern-

mental and non-governmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the technical committees are circulated to

the member bodies for approval before their acceptance as International Standards by

the IS0 Council. They are approved in accordance with IS0 procedures requiring at

least 75 % approval by the member bodies voting.
International Standard IS0 228-2 was prepared by Technical Committee ISO/TC 5,
Ferrous metal pipes and metallic fittings.

This second edition cancels and replaces the first edition (IS0 228-2 : 19801, of which it

constitutes a minor revision.

Users should note that all International Standards undergo revision from time to time

and that any reference made herein to any other International Standard implies its

latest edition, unless otherwise stated.
0 International Organization for Standardization, 1987
Printed in Switzerland
---------------------- Page: 4 ----------------------
SIST ISO 228-2:2001
IS0 228-2 : 1987 (E)
INTERNATIONAL STANDARD
Pipe threads where pressure-tight joints are not made on
the threads -
Part 2 I
Verification by means of limit gauges
Table 1
1 Scope and field of application
Symbol Explanation
This part of IS0 228 specifies the verification, by means of limit
gauges, of cylindrical threads, the dimensions and tolerances
Width of clearance groove at the major and minor

of which are given in IS0 228-l. diameter respectively of the thread profile with trun-

cated flanks
For industrial applications (see for example IS0 1179), it may be
d= D 1 Basic major diameter of the thread
necessary to carry out additional checks.
- 1,280 654 P : Basic minor diameter of the
1 d’ = D1 1 iredad
Since this 55O profile has different elements to be verified, it is
- d - 0,646 327 P : Basic pitch diameter of the
necessary to provide for several GO and several NOT GO
1 d2 = D2 1 thread
gauges :
m Distance between the middle of the tolerance zones
TR of the threaded ring gauge and TcP of the GO
a) the threaded GO gauges (see clauses 6 and 7) shall en-
check plug
sure that the profile of the machined piece does not exceed
Nominal value of b3
the maximum of material provided for by the tolerances ap- I I
plied to the dimensions of the profile defined by IS0 228-l;
P Pitch
I I I
Displacement of the clearance groove with trun-
b) the threaded NOT GO gauges for the threads of the
1 ’ ( cated flanks
pieces (see clauses 6 and 7) fix the minimum material limit
S Tolerance on b3
on the flanks of the thread. I I I
Tolerance on the pitch diameter of GO and NOT GO
threaded check plugs and wear check plugs
Reference checks may be carried out in specialized
NOTE -
laboratories.
Tolerance on the pitch diameter of the external
I Td2 I thread
Tolerance on the pitch diameter of the internal
1 TD2 1 thread
2 References
Tolerance on the pitch diameter of GO and NOT GO
threaded plug gauges
I TpL I
IS0 228-1, Pipe threads where pressure- tight joints are not
Tolerance on the pitch diameter of GO and NOT GO
made on the threads - Part I : Designation, dimensions and
threaded ring gauges
I TR I I
tolerances.
= 0,147 84 P : Twice the radial height of rounding
at crest and root of thread
I u I I
IS0 1179, Pipe connections, threaded to IS0 228- 7, for plain
Average amount available for the permissible wear
end steel and other metal tubes in industrial applications.
wGO
of GO threaded plug gauge and GO threaded ring
WJW
IS0 1502, IS0 general purpose metric screw threads -
Gauging. Average amount available for the permissible wear
WNG
of NOT GO threaded plug gauge and NOT GO
threaded ring gauge
Distance between the middle of the tolerance zone
ZPL
TPL of the GO threaded plug gauge and the lower
3 Symbols and explanations
limit of the thread
Distance between the middle of the tolerance zone
The symbols used in this part of IS0 228 are the same as those
TR of the GO threaded ring gauge and the upper
used in IS0 1502 for the IS0 thread gauges, plus some addi-
limit of the thread
tional symbols (n, S, u), as shown in table 1.
---------------------- Page: 5 ----------------------
SIST ISO 228-2:2001
IS0 228-2 : 1987 (E)
4.1.2.2 Use
4 Function, control and use of gauges
The threaded GO check plug screwed by hand, without ex-
4.1 Gauges for external threads and their check
cessive force, shall pass through the new solid threaded GO
ring gauge.
plugs
The threaded NOT GO check plug screwed by hand, without
4.1.1 Solid GO threaded ring gauge
excessive force, may enter into both ends of the new solid
threaded GO ring gauge, but not more than one turn of
thread. l)
4.1.1.1 Function
Wear check plug for solid threaded GO ring gauge
The threaded GO ring gauge checks the virtual size of the exter- 4.1.3
nal thread on the GO side (gauging the virtual pitch diameter),
i.e. it checks the maximum material limit of the pitch diameter,
4.1.3.1 Function
taking into account deviations of form (departures from round-
ness and lack of straightness of the thread axis over the gauge
The wear check plug is used to ascertain that the pitch diameter
length) and pitch errors, helix variations and errors in the flank
of the threaded GO ring gauge has not exceeded the wear limit.
angles, which produce an apparent enlargement of the pitch
It embodies the pitch diameter of the threaded GO ring gauge
diameter (virtual pitch diameter). In addition, this gauge checks
at the prescribed limit of wear.
whether the length of the straight flank is adequate, i.e. that
the rounding at the root of the profile does not encroach too far
4.1.3.2 Use
upon the flank of the thread.
The wear check plug screwed by hand, without excessive
This gauge shows the maximum material limit.
force, may enter into both ends of the threaded GO ring gauge,
but not more than one turn of thread?
Checking with the threaded GO ring gauge is essentially in ac-
cordance with the Taylor principle (see IS0 1502 : 1978, sub-
If it can be screwed in more than one turn of thread, the thread-
clause 7.1.1).
ed GO ring gauge no longer meets the specifications.
4.1.4 Solid threaded NOT GO ring gauge
4.1.1.2 Control
The solid threaded GO ring gauge manufactured according to
4.1.4.1 Function
the prescribed sizes shall be checked using the threaded GO
and NOT GO check plugs and should be controlled regularly
The threaded NOT GO ring gauge is intended to check whether
with the wear check plug.
the actual pitch diameter exceeds the specified minimum size.
The checking with the threaded NOT GO ring gauge does not
correspond to the Taylor principle when checking rigid machin-
If the NOT GO check plug is not used, other provisions shall be
ed pieces. In cases of non-rigid machined pieces, the departure
made so as to ensure that the maximum size of the pitch
from the Taylor principle is of less importance because of the
diameter of the threaded GO ring gauge is not exceeded.
flexibility of the pieces.
4.1.1.3 Use
4.1.4.2 Control
The threaded GO ring gauge screwed by hand, without ex-
The solid threaded NOT GO ring gauge manufactured accord-
cessive force, shall pass over the whole length of the thread. If
ing to the prescribed sizes shall be checked using the threaded
this is not possible, the thread does not comply with the
GO and NOT GO check plugs and should be controlled regular-
specifications.
ly with the wear check plug.
If the NOT GO check plug is not used, other provisions shall be
4.1.2 Threaded check plugs for new solid threaded GO
made to ensure that the maximum limit of the pitch diameter of
ring gauge
the new threaded NOT GO ring gauge is not exceeded.
4.1.2.1 Function
4.1.4.3 Use
The threaded NOT GO ring gauge, screwed by hand without
These threaded check plugs (GO and NOT GO) are used to

check the limits of the pitch diameter of the new solid threaded excessive force onto the thread, may be screwed on both sides

but not more than two turns of thread?
GO ring gauge.

1) The number of turns of thread is determined when unscrewing the plug or ring gauge.

---------------------- Page: 6 ----------------------
SIST ISO 228-2:2001
IS0 228-2 :I987 (E)
than two turns , the
If the gauge can be screwed more 4.2 Gauges for internal threads
comply with the specifications.
thread does not
4.2.1 Threaded GO plug gauge
gauge shall not pass completely
The threaded NOT GO ring
a threaded part having a length of three threads or less.
over
4.2.1.1 Function
The threaded GO plug gauge checks the virtual size of the inter-
4.1.5 Threaded check plugs for new solid threaded
nal thread on the GO side (gauging the virtual pitch diameter).
NOT GO ring gauge
This is effected by checking the minimum limit of the pitch
diameter, taking into account pitch errors, errors in the flank

4.1.5.1 Function angles, helix variations and deviations of form (departures from

roundness and lack of straightness of the thread axis over the
gauge length) which produce an apparent reduction of the
The check plugs (GO and NOT GO) are used to check the pitch
pitch diameter (virtual pitch diameter). In addition, it checks the
diameter limi
...