ISO 228-2:1987

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: Published
• Publication Date: 19-Aug-1987
• ICS: 21.040.30 - Special screw threads
• Technical Committee: ISO/TC 5/SC 5 - Threaded fittings, solder fittings, welding fittings, pipe threads, thread gauges
• Drafting Committee: ISO/TC 5/SC 5 - Threaded fittings, solder fittings, welding fittings, pipe threads, thread gauges
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 29-Mar-2022
• Ref Project: 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

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
b3
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
I
I
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
n
the maximum of material provided for by the tolerances ap- I 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
I
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
I
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.
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
b3
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
I
I
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
n
the maximum of material provided for by the tolerances ap- I 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
I
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
I
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.
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
...

IS0
228-2
NORME INTERNATIONALE
Deuxihme kdition
1987-08-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOAHAR OPrAHM3A~Mfl I-IO CTAH~APTM3A~Wl
Filetages de tuyauterie pour raccordement
sans 6tanch6it6 dans le filet -
Partie 2 I
Vhification par calibres ZI limites
Pipe threads where pressure- tight joints are not made on the threads -
Part 2 : Verification by means of limit gauges
Numb-o de rkfkence
IS0 228-2 : 1987 (F)

---------------------- Page: 1 ----------------------
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 normalement confide 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
gouvernementales, en liaison avec I ’ISO participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I ’ISO. Les Normes internationales sont approuvees confor-
mement aux procedures de I ’ISO qui requierent I ’approbation de 75 % au moins des
comites membres votants.
La Norme internationale IS0 228-2 a ete elaboree par le comite technique ISO/TC 5,
Tuyauteries en me ’taux ferreux et raccords mt+tafliques.
Cette deuxieme edition annule et remplace la premiere edition (IS0 228-2 : 1980), dont
elle constitue une revision mineure.
L ’attention des utilisateurs est attiree sur le fait que toutes les Normes internationales
sont de temps en temps soumises a revision et que toute reference faite a une autre
Norme internationale dans le present document implique qu ’il s ’agit, sauf indication
contraire, de la derniere edition.
@ Organisation internationale de normalisation, 1987 l
Imprime en Suisse

---------------------- Page: 2 ----------------------
IS0 228-2 : 1987 (F)
NORME INTERNATIONALE
Filetages de tuyauterie pour raccordement
sans 6tanchGt6 dans le filet -
Partie 2 :
Verification par calibres 3 limites
Tableau 1
1 Objet et domaine d ’application
Symbole Explication
La presente partie de I ’ISO 228 specific la verification par cali-
bres a limites des filetages cylindriques dont les dimensions et
Largeur du degagement aux diametres exterieur et
b3
tolerances sont fixees dans I ’ISO 228-l.
interieur respectivement du profil avec flancs rac-
courcis
Pour des applications industrielles (voir par exemple IS0 11791,
d=D Diametre exterieur de base du filetage
il peut etre necessaire d ’effectuer des controles supplementai-
d, = D, = d - 1,280 654 P : Diametre interieur de base du
res.
filetage
Ce profil de 55O comportant differents elements a verifier, il est
d2 = D2 = d - 0,640 327 P : Diametre sur flancs de base
necessaire de prevoir plusieurs calibres ENTRE et plusieurs cali-
du filetage
bres N ’ENTRE PAS :
m Distance entre le centre des zones de tolerances TR
de la bague filetee et Qp du tampon rapporteur
ENTRE
a) les calibres filet& ENTRE (voir chapitres 6 et 7) doivent
assurer que le profil de la piece usinee ne depasse pas le
n Valeur nominale de b3
maximum de matiere prevu par les tolerances appliquees
P Pas
aux dimensions du profil defini par I ’ISO 228-l;
s Deport du degagement du profil avec flancs rac-
cou rcis
b) les calibres filet& N ’ENTRE PAS pour les filetages des
pieces (voir chapitres 6 et 7) fixent la limite minimale de
S Tolerance sur b3
matiere sur flancs de filet.
Tolerance sur le diametre sur flancs des tampons
QP
rapporteurs ENTRE, N ’ENTRE PAS, et des temoins
NOTE - La verification des calibres peut etre effect&e dans des labo-
d ’usure
ratoires specialises.
Tolerance sur le diametre sur flancs du filetage exte-
Td2
rieur
Tolerance sur le diametre sur flancs du filetage inte-
TD2
2 Rhfhences
rieur
Tolerance sur le diametre sur flancs des tampons
IS0 228-1, Filetages de tuyauterie pour raccordement sans
TPL
filet& ENTRE et N ’ENTRE PAS
e tancheite dans le filet - Partie 7 : Designation, dimensions et
tolerances.
Tolerance sur le diametre sur flancs des bagues file-
tees ENTRE ET N ’ENTRE PAS
IS0 1179, Raccordements de tuyauteries, filet& se/on
u = 0,147 84 P : Deux fois la hauteur de l ’arrondi 8 la
/SO 228- 7, pour tubes a extremites lisses en acier et autres
c&e et au fond du profil filete
tubes me taffiques dans /es applications indus trielles.
Valeur moyenne representant I ’usure admissible du
wGO
tampon filet6 ENTRE et de la bague filetee ENTRE
IS0 1502, Filetages metriques /SO pour usages generaux -
Verification par calibres a limites. Valeur moyenne representant I ’usure admissible du
WNG
tampon filet6 N ’ENTRE PAS et de la bague filetee
N ’ENTRE PAS
Distance du centre de la zone de tolerance TpL du
ZPL
3 Symboles et explications
tampon filet6 ENTRE a la tote limite inferieure du
f iletage
Les symboles utilises dans la presente partie de I ’ISO 228 sont
Distance du centre de la zone de tolerance TR de la
identiques a ceux de I ’ISO 1502 pour le filetage ISO, avec quel-
bague filetee ENTRE a la tote limite superieure du
ques symboles additionnels (n, S, u), comme indique dans le
filetage
tableau 1.
1

---------------------- Page: 3 ----------------------
IS0 228-2 : 1987 (F)
4 Fonction, vhification et emploi des calibres 4.1.2.2 Emploi
Le rapporteur ENTRE doit pouvoir &re vis& a la main, sans
4.1 Calibres filet& pour filetages exthieurs et
effort excessif, dans la bague filetee ENTRE neuve.
leurs tampons rapporteurs
Le rapporteur N ’ENTRE PAS ne doit pas pouvoir, sans effort
excessif, etre visse 5 la main, ni d ’un c&6 ni de I ’autre de la
4.1.1 Bague filetbe ENTRE
bague filetee ENTRE neuve, de plus d ’un seul filet. ‘)
4.1.1.1 Fonction
4.1.3 Temoin d ’usure pour bague filet& ENTRE
La bague filetee ENTRE verifie la dimension virtuelle du filetage
4.1.3.1 Fonction
exterieur sur le cot6 ENTRE (verification du diametre virtue1 a
flancs de filet), c ’est-a-dire qu ’elle controle la dimension maxi-
Ce temoin d ’usure sert a verifier si le diametre sur flancs des
male de matiere du diametre sur flancs, y compris les &arts de
bagues filetees ENTRE n ’a pas depasse la limite d ’usure. II
forme (defauts de circularite et de rectitude de I ’axe de filetage
represente done le diametre sur flancs de la bague filetee
sur la longueur du calibre) et les erreurs de pas, d ’helice et
ENTRE a la limite d ’usure prescrite.
d ’angles de flanc. Ces erreurs de forme provoquent un agran-
dissement apparent du diametre sur flancs (diametre virtue1 a
4.1.3.2 Emploi
flancs de filet). Cette bague verifie, de plus, si la partie droite du
flanc est assez longue, c ’est-a-dire si I ’arrondi au fond du profil
Le temoin d ’usure ne doit pas pouvoir etre visse a la main, sans
ne penetre pas trop avant sur le flanc du profil.
effort excessif, ni d ’un tote ni de I ’autre de la bague ENTRE en
tours d ’usage, de plus d ’un seul filet?
Ce calibre verifie la limite maximale de matiere.
S ’il peut se visser de plus d ’un seul filet, la bague filetee ENTRE
La bague filetee ENTRE verifie essentiellement selon le principe
ne @pond plus aux prescriptions.
de Taylor (voir IS0 I!502 : 19781, paragraphe 7.1.1).
4.1.4 Bague filetee N ’ENTRE PAS
4.1.1.2 Verification
4.1.4.1 Fonction
La bague filetee ENTRE, fabriquee selon les dimensions prescri-
La bague filetee N ’ENTRE PAS est prevue pour verifier si le dia-
tes, doit etre verifiee par les tampons rapporteurs filet& ENTRE
metre sur flancs effectif depasse la dimension minimale speci-
et N ’ENTRE PAS, et devrait etre controlee regulierement par le
free. La verification avec la bague filetee N ’ENTRE PAS ne cor-
temoin d ’usure.
respond pas au principe de TAYLOR lors de la verification de
pieces usinees rigides. En cas de pieces usinees non rigides,
Si le tampon rapporteur N ’ENTRE PAS n ’est pas utilise,
I ’abandon du principe de Taylor rev& moins d ’importance, en
d ’autres mesures doivent etre prises pour s ’assurer que la
raison de la flexibilite des pieces.
dimension maximale du diametre sur flancs de la bague filetee
ENTRE n ’est pas depassee.
4.1.4.2 Verification
4.1.1.3 Emploi
La bague filetee N ’ENTRE PAS, fabriquee selon les dimensions
prescrites, doit etre verifiee par les tampons rapporteurs ENTRE
La bague filetee ENTRE doit pouvoir, sans effort excessif, etre
et N ’ENTRE PAS, et controlee regulierement par le temoin
vissee a la main sur toute la longueur du filetage a verifier. Si tel
d ’usure.
n ’est pas le cas, le filetage ne r&pond pas aux prescriptions.
Si le tampon rapporteur N ’ENTRE PAS n ’est pas utilise,
d ’autres mesures doivent etre prises pour s ’assurer que la limite
4.1.2 Tampons rapporteurs pour bague filetee ENTRE
maximale du diametre sur flancs de la bague filetee neuve
neuve
N ’ENTRE PAS n ’est pas depassee.
4.1.2.1 Fonction
4.1.4.3 Emploi
Ces tampons rapporteurs (ENTRE et N ’ENTRE PAS) sont utili- La bague filetee N ’ENTRE PAS ne doit pas pouvoir, sans effort
ses pour la verification des dimensions limites du diametre sur
excessif, etre vissee a la main de plus de deux filets, ni d ’un
flancs de la bague filetee ENTRE neuve.
cot& ni de I ’autre?
1) Le nombre de filets est determine lors du dhissage de la bague ou du tampon.
2

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I-SO 228-2 : 1987 (F)
Si elle peut etre vissee sur la piece de plus de deux filets, le file- 4.2 Calibres filet& pour filetages interieurs
tage ne &pond pas aux prescriptions.
4.2.1 Tampon filet6 ENTRE
La bague filetee N ’ENTRE PAS ne doit pas pouvoir passer com-
pletement sur un filetage ayant trois filets ou moins.
4.2.1.1 Fonction
Le tampon filete ENTRE verifie la dimension virtuelle du filetage
4.1.5 Tampons rapporteurs pour bague filethe N ’ENTRE
interieur sur le c&e ENTRE (verification du diametre virtue1 a
PAS neuve
flancs de filet). II verifie la dimension limite minimale du diame-
tre sur flancs, y compris les erreurs de pas, d ’helice, d ’angles de
4.1.5.1 Fonction
flancs et &arts de forme (defauts de circularite et de rectitude
de I ’axe de filetage sur la longueur du calibre), produisant une
Les tampons rapporteurs (ENTRE et N ’ENTRE PAS) sont utili- diminution apparente du diametre sur flancs (diametre virtue1 a
ses pour la verification des dimensions limites du diametre sur
flancs de filet). De plus, il controle la dimension minimale du
flancs de la bague filetee N ’ENTRE PAS neuve. Le rapporteur diametre exterieur et verifie egalement si la longueur du flanc
ENTRE verifie que le diametre de degagement de la bague file-
droit est suffisant
...