ISO 7-1:1994

Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation

Specified the designation and lays down the dimensions and tolerances of pipe threads. Gives terms and definition as well as symbols and explanations including examples of the complete designation for a thread. Figures 1 to 4 illustrate details. Tabulates thread dimensions from 1/16 up to and including 6 inch.

Filetages de tuyauterie pour raccordement avec étanchéité dans le filet — Partie 1: Dimensions, tolérances et désignation

Cevni navoji, pri katerih je tesnjenje izvedeno z navojem - 1. del: Mere, tolerance in označevanje

General Information

• Status: Published
• Publication Date: 11-May-1994
• 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: 28-Sep-2020
• Ref Project: SIST ISO 7-1:1995 - Pipe threads where pressure-tight joints are made on the threads -- Part 1: Dimensions, tolerances and designation

Relations

• Revises: ISO 7-1:1982 - Pipe threads where pressure-tight joints are made on the threads — Part 1: Designation, dimensions and tolerances
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL Is0
7-1
STANDARD
Third edition
1994-05-I 5
Pipe threads where pressure-tight joints
are made on the threads -
Part 1:
Dimensions, tolerances and designation
Filetages de tuyauterie pour raccordement avec Gtanchbitb dans le
filet -
Partie 1: Dimensions, tokrances et d&ignation
Reference number
IS0 7-l :I 994(E)

---------------------- Page: 1 ----------------------
IS0 7=1:1994(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 7-l was prepared by Technical Committee
lSO/lC 5, Ferrous metal pipes and metallic fittings, Subcommittee SC 5,
Threaded or plain end butt-welding fittings, threads, gauging of threads.
This third edition cancels and replaces the second edition (IS0 7-1:1982),
which has been technically revised.
IS0 7 consists of the following parts, under the general title Pipe threads
where pressure-tight joints are made on the threads:
- Part 1: Dimensions, tolerances and designation
- Part 2: Verification by means of limit gauges
Annex A of this part of IS0 7 is for information only.
0 IS0 1994
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

---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD 0 IS0 IS0 7=1:1994(E)
Pipe threads where pressure-tight joints are made on
the threads -
Part 1:
Dimensions, tolerances and designation
maintain registers of currently valid International
1 Scope
Standards.
This part of IS0 7 specifies the requirements for
IS0 7-2: 1982, Pipe threads where pressure-tight
thread form, dimensions, tolerances and designation
joints are made on the threads - Part 2: Verification
for jointing pipe threads, sizes 1 /I6 to 6 inclusive, for
by means of limit gauges.
joints made pressure-tight by the mating of the
threads. These threads are taper external, parallel
internal or taper internal and are intended for use with
3 Definitions
pipes suitable for threading and for valves, fittings or
other pipeline equipment interconnected by threaded
For the purposes of this part of IS0 7, the following
joints.
definitions apply (see also figures 3 and 5).
An appropriate jointing medium should be used on the
thread to ensure pressure-tight joints.
3.1 gauge diameter: Major diameter of the thread,
whether external or internal.
NOTES
3.2 major cone: Imaginary cone which just touches
1 Parallel external pipe threads are not suitable as jointing
the crests of a taper external thread or the roots of a
threads.
taper internal thread.
2 For pipe threads where pressure-tight joints are not
made on the threads, see IS0 228-l.
3.3 gauge plane: Plane, perpendicular to the axis
of the taper thread, at which the major cone has the
3 IS0 7-2 gives details of methods of verification of joint-
gauge diameter.
ing thread dimensions and form and recommended gauging
systems.
NOTE 4 For external threads the gauge plane is located
at a distance equal to the nominal gauge length from the
small end of the thread. For internal threads the gauge plane
2 Normative reference
is located at a distance of half-pitch behind the face of the
threaded part. This is in order to give consideration to the
start of the thread that has been removed by chamfering.
The following standard contains provisions which,
through reference in this text, constitute provisions
of this part of IS0 7. At the time of publication, the 3.4 gauge length: On an external thread, the dis-
tance from the gauge plane to the small end of the
edition indicated was valid. All standards are subject
thread.
to revision, and parties to agreements based on this
part of IS0 7 are encouraged to investigate the pos-
sibility of applying the most recent edition of the 3.5 reference plane: Visible surface of each of the
standard indicated below. Members of IEC and IS0 internally and externally threaded parts, which facili-
1

---------------------- Page: 3 ----------------------
0 IS0
IS0 7-1:1994(E)
tates the reading of the gauge when the thread is in- P Pitch
spected.
H Height of the triangle of the thread profile per-
pendicular to the thread axis
For internal threads it is the face of the internally
threaded part, for external threads it is the small end
h = 0,640 327 P; height of the thread profile be-
of the externally threaded part.
tween rounded crests and roots perpendicular
to the thread axis
3.6 complete thread: That part of the thread which
is fully formed at both crest and root.
Y Radius of rounded crests and roots
NOTE 5 When there is a chamfer at the start of the
D Major diameter of the internal thread at the
thread not exceeding one pitch in length, this is included in
gauge plane (gauge diameter - see 3.1)
the length of complete thread.
D - 1,280 654 P; minor diameter of the internal
Dl
3.7 incomplete thread: That part of the thread
thread at the gauge plane
which is fully formed at the root, but truncated at the
crest by its intersection with the cylindrical surface of
D - 0,640 327 P; pitch diameter of the internal
the product.
thread at the gauge plane
38 washout thread; vanish thread: That part of
d Major diameter of the external thread at the
hread which is not fully formed at the root.
the t
gauge plane (gauge diameter - see 3.1)
NOTE 6 The washout thread is produced by the bevel at = d - 1,280 654 P; minor diameter of the ex-
4
the start of the threading tool.
ternal thread at the gauge plane
3.9 useful thread: Complete thread plus incomplete = d - 0,640 327 P; pitch diameter of the ex-
d2
thread, excluding the washout thread. ternal thread at the gauge plane
Tolerance on the gauge length of an external
3.10 fitting allowance: Length of useful thread be-
Tl
thread
yond the gauge plane of an external thread required
to provide for assembly with an internal thread at the
Tolerance for the position of the gauge plane on
T2
upper limit of the tolerance.
an internal thread
NOTE 7 Internally threaded parts will have a sufficient
length to accommodate the fitting allowance, except when
5 Dimensions
they have a free run-out. See 7.2.2.
Pipe thread dimensions, in millimetres, are given in
3.11 wrenching allowance: Length of useful thread
table 1.
which is provided to accommodate the relative
movement
...

SLOVENSKI STANDARD
SIST ISO 7-1:1995
01-november-1995
&HYQLQDYRMLSULNDWHULKMHWHVQMHQMHL]YHGHQR]QDYRMHPGHO0HUHWROHUDQFHLQ
R]QDþHYDQMH
Pipe threads where pressure-tight joints are made on the threads -- Part 1: Dimensions,
tolerances and designation
Filetages de tuyauterie pour raccordement avec étanchéité dans le filet -- Partie 1:
Dimensions, tolérances et désignation
Ta slovenski standard je istoveten z: ISO 7-1:1994
ICS:
21.040.30 Posebni navoji Special screw threads
SIST ISO 7-1:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 7-1:1995

---------------------- Page: 2 ----------------------

SIST ISO 7-1:1995
INTERNATIONAL Is0
7-1
STANDARD
Third edition
1994-05-I 5
Pipe threads where pressure-tight joints
are made on the threads -
Part 1:
Dimensions, tolerances and designation
Filetages de tuyauterie pour raccordement avec Gtanchbitb dans le
filet -
Partie 1: Dimensions, tokrances et d&ignation
Reference number
IS0 7-l :I 994(E)

---------------------- Page: 3 ----------------------

SIST ISO 7-1:1995
IS0 7=1:1994(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 7-l was prepared by Technical Committee
lSO/lC 5, Ferrous metal pipes and metallic fittings, Subcommittee SC 5,
Threaded or plain end butt-welding fittings, threads, gauging of threads.
This third edition cancels and replaces the second edition (IS0 7-1:1982),
which has been technically revised.
IS0 7 consists of the following parts, under the general title Pipe threads
where pressure-tight joints are made on the threads:
- Part 1: Dimensions, tolerances and designation
- Part 2: Verification by means of limit gauges
Annex A of this part of IS0 7 is for information only.
0 IS0 1994
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

---------------------- Page: 4 ----------------------

SIST ISO 7-1:1995
INTERNATIONAL STANDARD 0 IS0 IS0 7=1:1994(E)
Pipe threads where pressure-tight joints are made on
the threads -
Part 1:
Dimensions, tolerances and designation
maintain registers of currently valid International
1 Scope
Standards.
This part of IS0 7 specifies the requirements for
IS0 7-2: 1982, Pipe threads where pressure-tight
thread form, dimensions, tolerances and designation
joints are made on the threads - Part 2: Verification
for jointing pipe threads, sizes 1 /I6 to 6 inclusive, for
by means of limit gauges.
joints made pressure-tight by the mating of the
threads. These threads are taper external, parallel
internal or taper internal and are intended for use with
3 Definitions
pipes suitable for threading and for valves, fittings or
other pipeline equipment interconnected by threaded
For the purposes of this part of IS0 7, the following
joints.
definitions apply (see also figures 3 and 5).
An appropriate jointing medium should be used on the
thread to ensure pressure-tight joints.
3.1 gauge diameter: Major diameter of the thread,
whether external or internal.
NOTES
3.2 major cone: Imaginary cone which just touches
1 Parallel external pipe threads are not suitable as jointing
the crests of a taper external thread or the roots of a
threads.
taper internal thread.
2 For pipe threads where pressure-tight joints are not
made on the threads, see IS0 228-l.
3.3 gauge plane: Plane, perpendicular to the axis
of the taper thread, at which the major cone has the
3 IS0 7-2 gives details of methods of verification of joint-
gauge diameter.
ing thread dimensions and form and recommended gauging
systems.
NOTE 4 For external threads the gauge plane is located
at a distance equal to the nominal gauge length from the
small end of the thread. For internal threads the gauge plane
2 Normative reference
is located at a distance of half-pitch behind the face of the
threaded part. This is in order to give consideration to the
start of the thread that has been removed by chamfering.
The following standard contains provisions which,
through reference in this text, constitute provisions
of this part of IS0 7. At the time of publication, the 3.4 gauge length: On an external thread, the dis-
tance from the gauge plane to the small end of the
edition indicated was valid. All standards are subject
thread.
to revision, and parties to agreements based on this
part of IS0 7 are encouraged to investigate the pos-
sibility of applying the most recent edition of the 3.5 reference plane: Visible surface of each of the
standard indicated below. Members of IEC and IS0 internally and externally threaded parts, which facili-
1

---------------------- Page: 5 ----------------------

SIST ISO 7-1:1995
0 IS0
IS0 7-1:1994(E)
tates the reading of the gauge when the thread i
...

NORME
IS0
INTERNATIONALE 7-1
Troisieme itdition
1994-05-I 5
Filetages de tuyauterie pour raccordement
avec btanchbitb dans le filet -
Partie 1:
Dimensions, tolbrances et dbsignation
Pipe threads where pressure-tight joints are made on the threads -
Part 1: Dimensions, tolerances and designation
Numbro de rbfkrence
IS0 7-l :I 994(F)

---------------------- Page: 1 ----------------------
IS0 7=1:1994(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 interesse 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 7-l a ete elaboree par le comite technique
ISOfK 5, Tuyauteries en m&aux ferreux et raccords m&alliques, sous-
comite SC 5, Raccords filet& ou ;j souder, filetages, calibres de
file tages.
Cette troisieme edition annule et remplace la deuxieme edition
(IS0 7-l :1982), dont elle constitue une revision technique.
L ’ISO 7 comprend les parties suivantes, presentees sous le titre general
Filetages de tuyauterie pour raccordement avec 6tanchkit6 dans le filet:
- Partie I: Dimensions, tokrances et dksigna tion
- Par-tie 2: Vkrification par calibres 2 limites
L ’annexe A de la presente partie de I’ISO 7 est donnee uniquement a titre
d ’information.
0 IS0 1994
Droits de reproduction rhervits. Sauf prescription diffhente, aucune partie de cette publi-
cation ne peut &tre reproduite ni utilisee sous quelque forme que ce soit et par aucun pro-
&de, Blectronique ou mkcanique, y compris la photocopie et les microfilms, sans I ’accord
kcrit de I ’kditeur.
Organisation internationale de normalisation
Case Postale 56 l CH-1211 Genkve 20 l Suisse
lmprimh en Suisse
ii

---------------------- Page: 2 ----------------------
NORME INTERNATIONALE 0 IS0
IS0 7=1:1994(F)
Filetages de tuyauterie pour raccordement avec
btanch6it6 dans le filet -
Partie 1:
Dimensions, tolbrances et dbsignation
partie de I’ISO 7 sont invitees a rechercher la possi-
1 Domaine d ’application
bilite d ’appliquer I’edition la plus recente de la norme
indiquee ci-apt-es. Les membres de la CEI et de I’ISO
La presente partie de I’ISO 7 prescrit les exigences
possedent le registre des Normes internationales en
relatives 8 la forme, aux dimensions, aux tolerances
vigueur a un moment donne.
et a la designation des filetages de tuyauterie pour
raccordement avec etancheite dans le filet, de di-
IS0 7-2:1982, Filetages de tuyauterie pour raccor-
mensions de filetage l/16 8 6 comprises. Ces file-
dement avec BtanchGit6 dans le filet - Pat-tie 2: W-
tages sont des filetages exterieurs coniques, des
rification par calibres 9 limites.
filetages interieurs cylindriques ou coniques et s ’ap-
pliquent aux tubes filet&, aux filetages de robinetterie
et aux raccords ou autres elements de tuyauterie as-
3 Dkfinitions
sembles avec des joints filet&.
Pour les besoins de la presente partie de I’ISO 7, les
II convient qu ’une mat&e d ’etancheite appropriee
definitions suivantes s ’appliquent (voir egalement les
soit interposee dans le joint pour assurer I’etancheite
figures 3 et 5).
dans le filet.
3.1 diamhtre de jauge: Diametre exterieur d ’un fi-
NOTES
letage exterieur ou interieur.
1
Les filetages exterieurs cylindriques ne conviennent pas
comme filetages etanches.
3.2 chine principal: Cone fictif tangent aux som-
mets d ’un filetage conique exterieur ou aux fonds
2
Pour les filetages de tuyauterie pour raccordement sans
d ’un filetage conique interieur.
etancheite dans le filet, voir IS0 228-l.
3.3 plan de jauge: Plan perpendiculaire a I’axe du
3 L ’ISO 7-2 donne des precisions sur les methodes de
filetage conique, dans lequel le diametre de jauge est
verification des dimensions et de la forme des filetages
etanches, et sur les systemes de calibrage recommandes. delimite par le cone principal.
NOTE 4 Dans le cas d ’un filetage exterieur, le plan de
jauge se trouve a une distance egale 8 la longueur de jauge
2 Rkfbrence normative
nominale mesuree a partir de I ’extremite. Dans le cas d ’un
filetage interieur, le plan de jauge se trouve a une distance
La norme suivante contient des dispositions qui, par
d ’un demi-pas derriere la face de la piece filetee. Cela per-
suite de la reference qui en est faite, constituent des
met de prendre en compte le debut du filet qui a ete elimine
dispositions valables pour la presente partie de I’ISO par le chanfrein.
7. Au moment de la publication, I’edition indiquee etait
en vigueur. Toute norme est sujette a revision et les 3.4 longueur de jauge: Distance entre le plan de
parties prenantes des accords fond& sur la presente jauge et I’extremite d ’un filetage exterieur.
1

---------------------- Page: 3 ----------------------
0 IS0
IS0 7=1:1994(F)
3.5 plan de rhfhence: Surface visible de chacune Filetage exterieur conique pour raccordement
R
des parties filetees interieurement et exterieurement, avec etancheite dans le filet
ce qui facilite la lecture du calibre lors de I’inspection
P Pas
du filetage.
H Hauteur du triangle du profil du filetage perpen-
Dans le cas des filetages interieurs, il s ’agit de la face
diculaire a I’axe du filetage
de la partie filetee interieurement, et dans le cas des
filetages exterieurs, il s ’agit de I’extremite de la partie
h = 0,640 327 P; hauteur du profil de filetage en-
filetee exterieurement.
tre sommets et fonds arrondis perpendiculaire
a I’axe du filetage
3.6 filetage complet: Partie de filetage ayant des
filets completement form& aussi bien 8 leurs som-
r Rayon des arrondis au sommet et a fond de filet
mets qu ’a leurs fonds.
D Diametre exterieur du filetage interieur dans le
NOTE 5 Si I ’extremite du filetage presente un chanfrein
plan de jauge (diametre de jauge, voir 3.1)
ne depassant pas la longueur d ’un pas, celui-ci sera compris
dans la longueur du filetage complet. D - 1,280 654 P; diametre interieur du filetage
D,
interieur dans le plan de jauge
3.7 filetage incomplet: Partie de filetage ayant des
D - 0,640 327 P; diametre sur flancs du filetage
fonds de filets complets mais des sommets tronques
interieur dans le plan de jauge
a leur intersection avec la surface cylindrique du pro-
duit.
d Diametre exterieur du filetage exterieur dans le
plan de jauge (diametre de jauge, voir 3.1)
3.8 sortie de filetage: Partie de filetage ayant des
fonds de filets incomplets.
= d - 1,280 654 P; diametre interieur du filetage
exterieur dans le plan de jauge
NOTE 6 La sortie de filetage est due a I ’angle d ’entree a
l’extremite de I ’outil a fileter.
= d - 0,640 327 P; diametre sur flancs du file-
tage exterieur dans le plan de jauge
3.9 filetage utile: Filetages complet et incomplet,
Tolerance sur la longueur de jauge d ’un filetage
ne comprenant pas la sortie de filetage.
exterieur
3.10 tokrance d ’assemblage: Longueur de filetage
Tolerance pour la position du plan de jauge sur
utile au-dela du plan de jauge d ’un filetage exterieur,
un filetage interieur.
necessaire 8 I’assemblage avec un filetage interieur a
la limite superieure de tolerance.
Dimensions
NOTE 7 Les parties filetees interieurement seront d ’une
Les dimensions des filetages, en millimetres, sont
longueur suffisante pour tenir compte de la tolerance d ’as-
donnees dans le tableau 1.
semblage, sauf lorsqu ’elles ont une sortie libre. Voir 7.2.2.
3.11 tokrance de serrage: Longueur de filetage
6 Dkignation
utile prevue pour le mouvement relatif entre l’extre-
mite de la par-tie filetee exterieurement et la partie fi- La designation des filetages conformes a la presente
partie de I’ISO 7 doit comprendre les elements sui-
letee interieurement, exigee pour le serrage au-dela
de la position obtenue par serrage a main. vants dans I’ordre ci-apres.
6.1 L
...