SIST ISO 7-1:1995

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: 31-Oct-1995
• ICS: 21.040.30 - Special screw threads
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1995
• Due Date: 01-Nov-1995
• Completion Date: 01-Nov-1995
• Ref Project: ISO 7-1:1994 - Pipe threads where pressure-tight joints are made on the threads

RELATIONS

• Revised: ISO 7-1:1982 - Pipe threads where pressure-tight joints are made on the threads
• 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-

---------------------- 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
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-

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-

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-
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
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

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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-

---------------------- Page: 5 ----------------------
SIST ISO 7-1:1995
0 IS0
IS0 7-1:1994(E)
tates the reading of the gauge when the thread i
...