SIST ISO 68-2:2002

ISO general-purpose screw threads -- Basic profile -- Part 2: Inch screw threads

This part of ISO 68 specifies the basic profile for ISO inch screw threads.

Filetages ISO pour usages généraux -- Profil de base -- Partie 2: Filetages en inches

La présente partie de l'ISO 68 spécifie le profil de base des filetages ISO en inches pour usages généraux.

Vijačni navoji ISO za splošno uporabo - Osnovni profil - 2. del: Colni vijačni navoji

General Information

• Status: Withdrawn
• Publication Date: 31-Jan-2002
• Withdrawal Date: 10-Jun-2024
• ICS: 21.040.20 - Inch screw threads
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 07-Jun-2024
• Due Date: 30-Jun-2024
• Completion Date: 11-Jun-2024
• Ref Project: ISO 68-2:1998 - ISO general purpose screw threads — Basic profile — Part 2: Inch screw threads

Relations

• Revised: SIST ISO 68:1995 - ISO general purpose screw threads -- Basic profile
• Effective Date: 12-May-2008
• Revised: ISO 68:1973 - ISO general purpose screw threads — Basic profile
• Effective Date: 12-May-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ISO 68-2:2002
01-februar-2002
9LMDþQLQDYRML,62]DVSORãQRXSRUDER2VQRYQLSURILOGHO&ROQLYLMDþQLQDYRML
ISO general-purpose screw threads -- Basic profile -- Part 2: Inch screw threads
Filetages ISO pour usages généraux -- Profil de base -- Partie 2: Filetages en inches
Ta slovenski standard je istoveten z: ISO 68-2:1998
ICS:
21.040.20 Colski navoji Inch screw threads
SIST ISO 68-2:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 68-2:2002

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SIST ISO 68-2:2002
INTERNATIONAL ISO
STANDARD 68-2
First edition
1998-12-15
ISO general purpose screw threads —
Basic profile —
Part 2:
Inch screw threads
Filetages ISO pour usages généraux — Profil de base —
Partie 2: Filetages en inches
A
Reference number
ISO 68-2:1998(E)

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

SIST ISO 68-2:2002
ISO 68-2:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO 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. ISO collaborates closely with the International Electrotechnical
Commission (IEC) 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 ISO 68-2 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee
SC 1, Basic data.
This first edition, together with ISO 68-1, cancels and replaces ISO 68:1973 which has been technically revised by
separating the metric dimensions from the imperial dimensions.
ISO 68 consists of the following parts under the general title ISO general purpose screw threads – Basic profile
— Part 1: Metric screw threads
— Part 2: Inch screw threads
Annex of this part of ISO 68 is for information only.
©  ISO 1998
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 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

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

SIST ISO 68-2:2002
©
INTERNATIONAL STANDARD  ISO ISO 68-2:1998(E)
ISO general purpose screw threads — Basic profile —
Part 2:
Inch screw threads
1  Scope
This part of ISO 68 specifies the basic profile for ISO inch screw threads.
2  Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 68. At the time of publication the editions indicated were valid. All standards are subject to revision and parties
to agreements based on this part of ISO 68 are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International
Standards.
ISO 5408:1983, Cylindrical screw threads – Vocabulary.
ISO 5864:1993, ISO inch screw threads — Allowances and tolerances.
3  Definitions
For the purpose of this part of ISO 68 the definitions given in ISO 5408 apply. Only the term "basic profile" which might be
usefully restated is defined below.
3.1
basic profile
The theoretical profile of a screw thread in an axial plane defined by theoretical dimensions and angles common to
internal and external threads
NOTE The basic profile is shown as a thick line in figure 1.
1

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SIST ISO 68-2:2002
©
ISO
ISO 68-2:1998(E)
where
D is the basic major diameter of internal thread (nominal diameter)
d is the basic major diameter of external thread (nominal diameter)
D
is the basic pitch diameter of internal thread
2
d is the basic pitch diameter of external thread
2
D
is the basic minor diameter of internal thread
1
d is the basic minor diameter of external thread
1
H is the height of fundamental triangle
P
is the pitch
Figure 1
4  Dimensions
The fundamental deviations and tolerances specified in ISO 5864 are applied to the dimensions of the basic profile
shown in figure 1 and derived from table 1.
0,866 025 404
H =
n
0,541 265 877
5
H =
8 n
3 0,324 759 526
H =
8 n
H 0,216 506 351
=
4 n
H 0,108 253 175
=
8 n
where n is the numbe
...

INTERNATIONAL ISO
STANDARD 68-2
First edition
1998-12-15
ISO general purpose screw threads —
Basic profile —
Part 2:
Inch screw threads
Filetages ISO pour usages généraux — Profil de base —
Partie 2: Filetages en inches
A
Reference number
ISO 68-2:1998(E)

---------------------- Page: 1 ----------------------
ISO 68-2:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO 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. ISO collaborates closely with the International Electrotechnical
Commission (IEC) 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 ISO 68-2 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee
SC 1, Basic data.
This first edition, together with ISO 68-1, cancels and replaces ISO 68:1973 which has been technically revised by
separating the metric dimensions from the imperial dimensions.
ISO 68 consists of the following parts under the general title ISO general purpose screw threads – Basic profile
— Part 1: Metric screw threads
— Part 2: Inch screw threads
Annex of this part of ISO 68 is for information only.
©  ISO 1998
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 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
©
INTERNATIONAL STANDARD  ISO ISO 68-2:1998(E)
ISO general purpose screw threads — Basic profile —
Part 2:
Inch screw threads
1  Scope
This part of ISO 68 specifies the basic profile for ISO inch screw threads.
2  Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 68. At the time of publication the editions indicated were valid. All standards are subject to revision and parties
to agreements based on this part of ISO 68 are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International
Standards.
ISO 5408:1983, Cylindrical screw threads – Vocabulary.
ISO 5864:1993, ISO inch screw threads — Allowances and tolerances.
3  Definitions
For the purpose of this part of ISO 68 the definitions given in ISO 5408 apply. Only the term "basic profile" which might be
usefully restated is defined below.
3.1
basic profile
The theoretical profile of a screw thread in an axial plane defined by theoretical dimensions and angles common to
internal and external threads
NOTE The basic profile is shown as a thick line in figure 1.
1

---------------------- Page: 3 ----------------------
©
ISO
ISO 68-2:1998(E)
where
D is the basic major diameter of internal thread (nominal diameter)
d is the basic major diameter of external thread (nominal diameter)
D
is the basic pitch diameter of internal thread
2
d is the basic pitch diameter of external thread
2
D
is the basic minor diameter of internal thread
1
d is the basic minor diameter of external thread
1
H is the height of fundamental triangle
P
is the pitch
Figure 1
4  Dimensions
The fundamental deviations and tolerances specified in ISO 5864 are applied to the dimensions of the basic profile
shown in figure 1 and derived from table 1.
0,866 025 404
H =
n
0,541 265 877
5
H =
8 n
3 0,324 759 526
H =
8 n
H 0,216 506 351
=
4 n
H 0,108 253 175
=
8 n
where n is the number of threads per inch.
2

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©
ISO
ISO 68-2:1998(E)
Table 1
Dimensions in inches
Number
of
Pitch
5 3
H H
H
H H
threads
8 8 4 8
per inch
P
n
80 0,012 500 0,010 825 0,006 766 0,004 059 0,002 706 0,001 353
72 0,013 889 0,012 028 0,007 518 0,004 511 0,003 007 0,001 504
64 0,015 625 0,013 532 0,008 457 0,005 074 0,003 383 0,001 691
56 0,017 857 0,015 465 0,009 665 0,005 799 0,003 866 0,001 933
48 0,020 833 0,018 042
0,011 276 0,006 766 0,004 511 0,002 255
44 0,022 727 0,019 682 0,012 301 0,007 381 0,004 921 0,002 460
40 0,025 000 0,021 651 0,013 532 0,008 119 0,005 413 0,002 706
36 0,027 778 0,024 056 0,015 035 0,009 021 0,006 014 0,003 007
32 0,031 250 0,027 063 0,016 915 0,010 149 0,006 766 0,
...

NORME ISO
INTERNATIONALE 68-2
Première édition
1998-12-15
Filetages ISO pour usages généraux —
Profil de base —
Partie 2:
Filetages en inches
ISO general purpose screw threads — Basic profile —
Part 2: Inch screw threads
A
Numéro de référence
ISO 68-2:1998(F)

---------------------- Page: 1 ----------------------
ISO 68-2:1998(F)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour
vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comités
membres votants.
La Norme internationale ISO 68-2 a été élaborée par le comité technique ISO/TC 1, Filetages, sous-comité SC 1,
Données fondamentales.
Cette première édition de l’ISO 68-2 ainsi que l’ISO 68-1 annulent et remplacent l’ISO 68:1973, dont elles
constituent une révision technique, en ce sens qu’elles séparent les dimensions métriques des dimensions en
inches.
L’ISO 68 comprend les parties suivantes, présentées sous le titre général Filetages ISO pour usages généraux —
Profil de base:
 Partie 1: Filetages métriques
 Partie 2: Filetages en inches
L’annexe A de la présente partie de l’ISO 68 est donnée uniquement à titre d’information.
©  ISO 1998
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
Imprimé en Suisse
ii

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©
NORME INTERNATIONALE  ISO ISO 68-2:1998(F)
Filetages ISO pour usages généraux — Profil de base —
Partie 2:
Filetages en inches
1  Domaine d’application
La présente partie de l'ISO 68 spécifie le profil de base des filetages ISO en inches pour usages généraux.
2  Références normatives
Les normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite, constituent des
dispositions valables pour la présente partie de l'ISO 68. Au moment de la publication, les éditions indiquées étaient
en vigueur. Toute norme est sujette à révision et les parties prenantes des accords fondés sur la présente partie de
l'ISO 68 sont invitées à rechercher la possibilité d'appliquer les éditions les plus récentes des normes indiquées
ci-après. Les membres de la CEI et de l'ISO possèdent le registre des Normes internationales en vigueur à un
moment donné.
ISO 5408:1983, Filetages cylindriques — Vocabulaire.
ISO 5864:1993, Filetages ISO en inches — Jeux et tolérances.
3  Définitions
Pour les besoins de la présente partie de l'ISO 68, les définitions données dans l'ISO 5408 s'appliquent. Seul le
terme «profil de base», qu'il peut être utile de rappeler, est défini ci-après.
3.1
profil de base
profil théorique de filetage défini dans un plan axial par des dimensions et des angles théoriques communs pour les
filetages intérieurs et extérieurs
NOTE Le profil de base est représenté en trait fort à la figure 1.
1

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©
ISO
ISO 68-2:1998(F)
où
D est le diamètre extérieur de base du filetage intérieur (diamètre nominal)
d est le diamètre extérieur de base du filetage extérieur (diamètre nominal)
D est le diamètre sur flancs de base du filetage intérieur
2
d est le diamètre sur flancs de base du filetage extérieur
2
D est le diamètre intérieur de base du filetage intérieur
1
d est le diamètre intérieur de base du filetage extérieur
1
est la hauteur du triangle primitif
H
P est le pas
Figure 1
4  Dimensions
Les écarts fondamentaux et tolérances spécifiés dans l'ISO 5864 s'appliquent au profil de base indiqué à la figure 1
et dérivé des valeurs du tableau 1.
0,866 025 404
H =
n
5 0,541 265 877
H =
8 n
3 0,324 759 526
H =
8 n
H 0,216 506 351
=
4 n
H 0,108 253 175
=
8 n
n
où est le nombre de filets par inch.
2

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©
ISO
ISO 68-2:1998(F)
Tableau 1
Dimensions en inches
Nombre
Pas 5 3 H H
de filets
H H H
par inch
8 8 4 8
P
n
80 0,012 500 0,010 825 0,006 766 0,004 059 0,002 706 0,001 353
72 0,013 889 0,012 028 0,007 518 0,004 511 0,003 007 0,001 504
64 0,015 625 0,013 532 0,008 457 0,005 074 0,003 383 0,
...