SIST ISO 263:1998

ISO inch screw threads -- General plan and selection for screws, bolts and nuts -- Diameter range 0.06 to 6 inch

Tabulates inch threads having the basic profile for triangular threads specified in ISO 68; contains sizes in the diameter range between 0.06 to 6 inch, comprising a number of series of diameter/pitch combinations, together with a system of thread designations.

Filetages ISO en inches -- Vue d'ensemble et sélection pour boulonnerie -- Diamètres de 0,06 à 6 in

Colski navoj ISO - Splošni osnutek in izbira navojev, vijakov in matic - Velikostni red premerov od 0,06 do 6 col

General Information

• Status: Published
• Publication Date: 31-Jul-1998
• ICS: 21.040.20 - Inch screw threads
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Aug-1998
• Due Date: 01-Aug-1998
• Completion Date: 01-Aug-1998
• Ref Project: ISO 263:1973 - ISO inch screw threads - General plan and selection for screws, bolts and nuts - Diameter range 0,06 to 6 in

Overview

SIST ISO 263:1998 establishes a comprehensive standard for inch screw threads, focusing on the general plan and selection criteria for screws, bolts, and nuts within a diameter range of 0.06 to 6 inches. Developed by the International Organization for Standardization (ISO), this standard provides tabulated data for inch-based threads featuring the basic triangular thread profile as specified in ISO 68. It offers a clear classification system, including a variety of series with different diameter/pitch combinations and a structured system for thread designations. This standard replaces the earlier ISO/R 263-1962 recommendation, ensuring consistency and precision in thread specifications for mechanical engineering and commercial fasteners.

---

Key Topics

• Thread Series and Designation
  The standard divides inch screw threads into several series, categorized by pitch behavior:

  • Coarse Pitch Series (UNC): Recommended for general-purpose fasteners and bolts, extending up to 4 inches diameter.
  • Fine Pitch Series (UNF): Offers greater tensile strength and is suitable for applications requiring enhanced thread resistance.
  • Extra Fine Series (UNEF): Intended for smaller diameters up to 1 11/16 inches, providing very fine pitch threads ideal for thin-walled parts and high-precision uses.
  • Constant Pitch Series (UN): Includes threads with uniform pitch (such as 4 to 32 threads per inch), providing extended combinations where standard coarse or fine pitches do not fit requirements.

• Diameter and Pitch Range
  The standard covers diameters from 0.06 inch to 6 inches, accommodating a broad spectrum of engineering applications. It tabulates multiple combinations of diameter and pitch widely used in industrial and commercial fasteners.

• Thread Profile
  All threads conform to the basic triangular profile of ISO 68, ensuring international uniformity and interchangeability.

• Applications and Selection Guidelines
  Guidelines for choosing the appropriate thread series based on application needs, mechanical resistance, material types, and operating conditions are provided. For example, coarse threads suit materials with low tensile strength like cast iron or soft steel, whereas fine or extra-fine threads are preferred for rapid assembly/disassembly and for thin materials.

• Designation System
  Clear examples of thread designations (e.g., 1/4-20 UNC, 1/4-28 UNF, 1/4-32 UNEF) are included to standardize communication and specification in design documents and supply chains.

---

Applications

SIST ISO 263:1998 serves as a critical reference for industries and engineers involved in:

• Mechanical Engineering: Creating reliable fastener connections with standardized threads for assemblies ranging from machinery parts to structural components.
• Manufacturing: Guiding production and quality control of screws, bolts, nuts, and threaded components with consistent thread profiles and sizes.
• Automotive and Aerospace: Ensuring precision and safety in thread usage where mechanical properties and durability are key.
• Maintenance and Repairs: Supporting interchangeability in fastener replacement and repairs with globally recognized thread designations.
• Commercial Fasteners Industry: Helping manufacturers and suppliers classify and market inch-based threaded fasteners internationally.

By adopting ISO 263, industries achieve greater compatibility, reliability, and efficiency in threaded fastener applications.

---

Related Standards

• ISO 68: Defines the basic profile for metric and inch triangular thread forms, serving as the foundational geometry for ISO 263 threads.
• ISO 898: Covers mechanical properties of fasteners, complementing thread standards by specifying material strength requirements.
• ANSI/ASME B1.1: U.S. standard for Unified Inch Screw Threads, often aligned or referenced alongside ISO 263 for compatibility.
• ISO 965: Specifies general tolerances for ISO metric screw threads, relevant for dimensional accuracy and fitting performance.

Understanding ISO 263 in conjunction with these standards ensures comprehensive knowledge of thread geometry, strength, tolerances, and material considerations.

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Keywords: ISO 263, inch screw threads, thread diameter range, ISO 68 triangular profile, UNC, UNF, UNEF, thread designations, bolt thread standards, mechanical fasteners, screw thread pitch, ISO thread series, thread profile selection, industrial fasteners, bolt and nut standards, inch fastener threads.

Standards Content (Sample)

SLOVENSKI STANDARD
01-avgust-1998
Colski navoj ISO - Splošni osnutek in izbira navojev, vijakov in matic - Velikostni
red premerov od 0,06 do 6 col
ISO inch screw threads -- General plan and selection for screws, bolts and nuts --
Diameter range 0.06 to 6 inch
Filetages ISO en inches -- Vue d'ensemble et sélection pour boulonnerie -- Diamètres de
0,06 à 6 in
Ta slovenski standard je istoveten z: ISO 263:1973
ICS:
21.040.20 Colski navoji Inch screw threads
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAX OPTAHM3ALJMII l-IO CTAHAAPTW3AIJWM .ORGANISATION INTERNATIONALE DE NORMALISATION
IS0 inch screw threads - General plan and selection for
screws, bolts and nuts - Diameter range 0,06 to 6 in
First edition - 1973-04-01
UDC 621.882.082.2 Ref. No. IS0 263-1973 (E)
Descriptors : fasteners, threads, screw threads, screws, bolts, nuts (fasteners), dimensions, diameters, thread pitch, designation.
Price based on 5 pages
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up 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.
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.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, International
Standard IS0 263 replaces IS0 Recommendation R 263-1962 drawn up by
Technical Committee lSO/TC 1, Screw threads.
The Member Bodies of the following countries approved the Recommendation :
Argentina France New Zealand
Australia Germany Norway
Austria Greece Poland
Canada Hungary Spain
Chile India Switzerland
Colombia Israel United Kingdom
Italy U.S.A.
Czechoslovakia
Denmark Japan
Netherlands
Finland
following countries expressed disapproval of the
The Member Bodies of the
grounds :
Recommendation on technical
Bulgaria
Sweden
U.S.S.R.
0 International Organization for Standardization, 1973 l
Printed in Switzerland
INTERNATIONAL STANDARD IS0 2634973 (E)
IS0 inch screw threads - General plan and selection for
screws, bolts and nuts - Diameter range 0.06 to 6 in
1 SCOPE AND FIELD OF APPLICATION 2.2.1 Series with graded pitches
This International Standard tabulates IS0 inch screw
There are three series with graded pitches. They are headed
threads (except for pipe threads) having the basic profile “coarse”, “fine” and “extra-fine”, in compliance with
for triangular screw threads specified in IS0 68, /SO general present practice.
purpose screw threads - Basic profile.
These terms denote the relative magnitudes of the pitches
It comprises both a general plan of the IS0 inch screw
of the three series for any given diameter of thread and do
threads and the IS0 inch screw threads for screws, bolts
not imply any difference in the quality of the threads in the
and nuts, the latter being a selection from the former.
series.
The coarse and fine thread series shall be the first choice for
It contains sizes in the diameter range 0.06 to 6 in,
of series of diameter/pitch general engineering applications, and they form the selected
comprising a number
with a system of thread series for the commercial production of screws, bolts and
combinations, together
nuts.
designations.
It remains for each industry to choose for itself, by means
2.2.2 Series with constant (uniform) pitches
of selection among the screw threads of this International
Standard, the diameter/pitch combinations appropriate to
In addition to the three series of graded pitches, Table 1
its own needs.
includes columns of constant pitches which have been
selected from the range 4 to 32 threads per inch. Each of
2 THREADS SERIES
these series is limited to an appropriate range of diameters.
The general plan is characterized by a number of thread
series, i.e. groups of diameter/pitch combinations distin-
guished from each other by the number of threads per
3 DESIGNATIONS
inch associated with specific diameters of threads. These
thread series are shown in Table 1.
The screw threads in this general plan are designated as
shown in the column headings of Table 1, i.e. as follows :
2.1 Diameters
3.1 Series with graded pitches
Columns 1 and 2 of Table 1 give primary and secondary
sizes which should suffice to meet the common needs of
Coarse thread series : designation UNC;
design. Column 3 gives the decimal equivalents of these
for example : l/4-20 UNC, No. 4-40 UNC
sizes.
Fine thread series : designation UNF;
2.2 Number of threads per inch for example : l/4-28 UNF, No. 4-48 UNF
Columns 4 to 14 (inclusive) of Table 1 give the number of Extra-fine thread series : designation UNEF;
threads per inch which are recommended for association for example : l/4-32 UNEF.
with the sizes in columns 1 and 2. These columns of threads
per inch are divided into two groups :
3.2 Series with constant (uniform) pitches
-
series with graded pitches : columns 4, 5 and 6;
All of the diameter/pitch combinations of the threads in
-
series with constant (uniform) pitches : columns 7 to these constant-pitch series are designated UN; for example
14. 1-16 UN.
IS0 263-1973 (E)
4 DIAMETER/PITCH COMBINATIONS
TABLE 1 - biametedpitch
Number of threads per inch
Basic Series with 1
Series with constant (uniform) pitches
Sizes
Major graded pitches /
diameter
Coarse Fine ’ Extra-1 4-thread 6-thread &thread 1%
160 20-
thread thread fine I series
series series thread thread thread
series series thread
series series series
l
l
series
Pri- Secon- -
UNC UNF UNEFi UN UN UN UN UN UN
mary dary , in
I
!
-----
1 I 2 I 3 4 / 5 1 6 1 7 1 8 ! 9 / lo ’ 11 1 12 ( 13 1 14
I
I I I
No. 5 0.125 0 40 44
-p-p-
UNC
No. 8 10.164 0 32 UNC
go. 10 0.1900 24 32 I UNF
No.12 0.2160 24 28 1 32 1 UNF IUNEF
--- --I
-I- -<------
UNC UNF /UNEF
20 28 UNEF
UNC ’ 20 28 UNEF
---
UNF UNEF 32
0.562 5 12 18 UNC 16 20 28 32
12 16 20 28 32
12 16 20 28 32
UNF UNEF 28 32
-----
13/16 0.812 5 16 UNEF 28 32
0.875 0 9 14 12 16 UNEF 28 32
15/1(3 0.937 5 12 16 UNEF 28 32
--- PIP- ---,----
1 1.0000 8 12 I 20 1 UNC UNF 16 UNEF 28 32
1 l
...

INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAX OPTAHM3ALJMII l-IO CTAHAAPTW3AIJWM .ORGANISATION INTERNATIONALE DE NORMALISATION
IS0 inch screw threads - General plan and selection for
screws, bolts and nuts - Diameter range 0,06 to 6 in
First edition - 1973-04-01
UDC 621.882.082.2 Ref. No. IS0 263-1973 (E)
Descriptors : fasteners, threads, screw threads, screws, bolts, nuts (fasteners), dimensions, diameters, thread pitch, designation.
Price based on 5 pages
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up 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.
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.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, International
Standard IS0 263 replaces IS0 Recommendation R 263-1962 drawn up by
Technical Committee lSO/TC 1, Screw threads.
The Member Bodies of the following countries approved the Recommendation :
Argentina France New Zealand
Australia Germany Norway
Austria Greece Poland
Canada Hungary Spain
Chile India Switzerland
Colombia Israel United Kingdom
Italy U.S.A.
Czechoslovakia
Denmark Japan
Netherlands
Finland
following countries expressed disapproval of the
The Member Bodies of the
grounds :
Recommendation on technical
Bulgaria
Sweden
U.S.S.R.
0 International Organization for Standardization, 1973 l
Printed in Switzerland
INTERNATIONAL STANDARD IS0 2634973 (E)
IS0 inch screw threads - General plan and selection for
screws, bolts and nuts - Diameter range 0.06 to 6 in
1 SCOPE AND FIELD OF APPLICATION 2.2.1 Series with graded pitches
This International Standard tabulates IS0 inch screw
There are three series with graded pitches. They are headed
threads (except for pipe threads) having the basic profile “coarse”, “fine” and “extra-fine”, in compliance with
for triangular screw threads specified in IS0 68, /SO general present practice.
purpose screw threads - Basic profile.
These terms denote the relative magnitudes of the pitches
It comprises both a general plan of the IS0 inch screw
of the three series for any given diameter of thread and do
threads and the IS0 inch screw threads for screws, bolts
not imply any difference in the quality of the threads in the
and nuts, the latter being a selection from the former.
series.
The coarse and fine thread series shall be the first choice for
It contains sizes in the diameter range 0.06 to 6 in,
of series of diameter/pitch general engineering applications, and they form the selected
comprising a number
with a system of thread series for the commercial production of screws, bolts and
combinations, together
nuts.
designations.
It remains for each industry to choose for itself, by means
2.2.2 Series with constant (uniform) pitches
of selection among the screw threads of this International
Standard, the diameter/pitch combinations appropriate to
In addition to the three series of graded pitches, Table 1
its own needs.
includes columns of constant pitches which have been
selected from the range 4 to 32 threads per inch. Each of
2 THREADS SERIES
these series is limited to an appropriate range of diameters.
The general plan is characterized by a number of thread
series, i.e. groups of diameter/pitch combinations distin-
guished from each other by the number of threads per
3 DESIGNATIONS
inch associated with specific diameters of threads. These
thread series are shown in Table 1.
The screw threads in this general plan are designated as
shown in the column headings of Table 1, i.e. as follows :
2.1 Diameters
3.1 Series with graded pitches
Columns 1 and 2 of Table 1 give primary and secondary
sizes which should suffice to meet the common needs of
Coarse thread series : designation UNC;
design. Column 3 gives the decimal equivalents of these
for example : l/4-20 UNC, No. 4-40 UNC
sizes.
Fine thread series : designation UNF;
2.2 Number of threads per inch for example : l/4-28 UNF, No. 4-48 UNF
Columns 4 to 14 (inclusive) of Table 1 give the number of Extra-fine thread series : designation UNEF;
threads per inch which are recommended for association for example : l/4-32 UNEF.
with the sizes in columns 1 and 2. These columns of threads
per inch are divided into two groups :
3.2 Series with constant (uniform) pitches
-
series with graded pitches : columns 4, 5 and 6;
All of the diameter/pitch combinations of the threads in
-
series with constant (uniform) pitches : columns 7 to these constant-pitch series are designated UN; for example
14. 1-16 UN.
IS0 263-1973 (E)
4 DIAMETER/PITCH COMBINATIONS
TABLE 1 - biametedpitch
Number of threads per inch
Basic Series with 1
Series with constant (uniform) pitches
Sizes
Major graded pitches /
diameter
Coarse Fine ’ Extra-1 4-thread 6-thread &thread 1%
160 20-
thread thread fine I series
series series thread thread thread
series series thread
series series series
l
l
series
Pri- Secon- -
UNC UNF UNEFi UN UN UN UN UN UN
mary dary , in
I
!
-----
1 I 2 I 3 4 / 5 1 6 1 7 1 8 ! 9 / lo ’ 11 1 12 ( 13 1 14
I
I I I
No. 5 0.125 0 40 44
-p-p-
UNC
No. 8 10.164 0 32 UNC
go. 10 0.1900 24 32 I UNF
No.12 0.2160 24 28 1 32 1 UNF IUNEF
--- --I
-I- -<------
UNC UNF /UNEF
20 28 UNEF
UNC ’ 20 28 UNEF
---
UNF UNEF 32
0.562 5 12 18 UNC 16 20 28 32
12 16 20 28 32
12 16 20 28 32
UNF UNEF 28 32
-----
13/16 0.812 5 16 UNEF 28 32
0.875 0 9 14 12 16 UNEF 28 32
15/1(3 0.937 5 12 16 UNEF 28 32
--- PIP- ---,----
1 1.0000 8 12 I 20 1 UNC UNF 16 UNEF 28 32
1 l/l6 1.062 5 8 12 16 20 28
1 1/a 1.1250 7 12 18 8 UNF 16 20 28
.-j----
1 3/16 1.187 5 18 8 1 12 16 20 28
1 l/4 1.2500 7 12 18 8 I UNF 16 20 28
1 5/16 1.312 5 12 / 16 20 28
-’ ----
UNC 8 UNF 1 16 1 20 28
6 8 12 j 16 20 , 28
UNC 8 UNF / 16 1 20 28
I--‘----
6 8 12 1 16 20
6 8 12 16 20
6 8 12 16 20
----- --/----
1 314 1.750 0 5 6 8 12 16 20
6 8 12 16 20
6 8 12 16 20
...

NORME INTERNATIONALE
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXAYHAPOAHA(I OPrAHW3ALV-W l-IO CTAHAAPTW3ALJZ4W.ORGANISATION INTERNATIONALE DE NORMALISATION
Vue d’ensemble et Glection pour
Filetages IS0 en inches -
boulonnerie - DiamGtres de 0,06 B 6 in
Premike bdition - 1973-04-01
Mf. NO : IS0 263-1973 (F)
CDU 621.882.082.2
Descripteurs : Mment de fixation, pas de vis, filet de vis, vis, boulon, krou, dimension, diamhtre, pas de filetage, designation.
Prix bas6 sur 5 pages
AVANT-PROPOS
IS0 (Organisation Internationale de Normalisation) est une federation mondiale
d’organismes nationaux de normalisation (Comites Membres ISO). L’elaboration de
Normes Internationales est confide aux Comites Techniques ISO. Chaque Comite
Membre inter-es& par une etude a le droit de faire partie du Comite Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent egalement aux travaux.
Les Projets de Normes lnternationales adopt& par les Comites Techniques sont
soumis aux Comites Membres pour approbation, avant leur acceptation comme
Normes lnternationales par le Conseil de I’ISO.
Avant 1972, les resultats des travaux des Comites Techniques etaient publies
comme Recommandation ISO; maintenant, ces documents sont en tours de
transformation en Normes lnternationales. Compte tenu de cette procedure, la
Norme Internationale IS0 263 remplace la Recommandation lSO/R 263-1962
etablie par le Comite Technique ISO/TC 1, Filetages.
Les Comites Membres des pays suivants avaient approuve la Recommandation :
Allemagne Finlande
Nouvelle-Zelande
Argentine France
Pays-Bas
Australie Grece
Pologne
Autriche Hongrie Royaume-Uni
Canada lnde Su isse
Chili Israel Tchecoslovaquie
Colombie Italie
U.S.A.
Danemark Japon
Espagne Norvege
desapprouve la Recommandation
Les Comites Membres des pays suivants avaient
pour des raisons techniques
Bulgarie
Suede
U.R.S.S.
0 Organisation internationale de Normalisation, 1973 l
Imprim en Suisse
NORME INTERNATIONALE IS0 263-1973 (F)
Filetages IS0 en inches -
Vue d’ensemble et Aection pour
boulonnerie
- Diametres de 0,06 a 6 in
2.2.1 Shies P pas croissants
1 OBJET ET DOMAINE D’APPLICATION
II y a trois series a pas croissants. Elles sont intitulees ((Pas
La presente Norme Internationale contient les tableaux des
grow, ((Pas fin)) et ((Pas extra-fin)), en accord avec la
filetages IS0 en inches (except6 les filetages pour tubes),
pratique actuelle.
ayant le profil de base triangulaire ISO, selon IS0 68,
.Filetages /SO pour usages ghkaux - Profil de base.
Ces termes indiquent la grandeur relative du pas de trois
Elle comprend a la fois la vue d’ensemble des filetages IS0
series pour chaque diametre don& de filetage et
en inches et les filetages IS0 en inches pour boulonnerie, n’impliquent pas une difference de qualite entre les series.
ces derniers etant une selection des filetages prevus dans la
Les series de filetages a pas gros et fin doivent 8tre choisies
vue d’ensemble.
en premier lieu pour les applications generales de la
Elle donne, pour les diametres de 0,06 a 6 in, diverses series
construction mecanique et elles forment la selection pour la
de combinaisons pas-diametres et egalement un systeme de
boulonnerie commerciale.
designation des f iletages.
I I appartient a chaque industrie de choisir elle-meme, par
2.2.2 Skies 5 pas constant (uniforme)
sklection parmi les filetages de la presente Norme
I nternationale, les combinaisons pas-diametres appropries a
En plus de trois series a pas croissants, le Tableau 1
ses propres besoins.
comprend des colonnes de pas constants qui ont ete choisis
dans la gamme de 4 a 32 filets par inch. Chacune de ces
series est limitee a une gamme appropriee de diametres.
2 SERIES DE FILETAGES
La vue d’ensemble est caracterisee par diverses series de
f i Ietages, c’est-a-dire par des groupes de combinaisons
pas-diametres se distinguant les uns des autres par le
3 DESIGNATION
nombre de filets par inch associes a un diametre donne de
filetage. Ces series de filetages sont donnees dans le
Tableau 1.
Les filetages de cette vue d’ensemble sont design& comme
indique dans les t&es de colonnes du Tableau 1, c’est-a-dire
2.1 Diametres
comme suit :
Les colonnes 1 et 2 du Tableau 1 donnent les dimensions
principales et secondaires devant suffire aux besoins
3.1 Series 5 pas croissants
courants des bureaux d’etude. La colonne 3 donne les
equivalents decimaux de ces dimensions. Serie a pas gros : designation UNC;
: l/4-20 UNC, No 4-40 UNC
par exemple
2.2 Nombre de filets par inch
Serie a pas fin : designation UNF;
par exemple : l/4-28 UNF, No 4-48 UNF
Les colonnes 4 a 14 (inclusivement) du Tableau 1 donnent
Serie a pas extra-fin : designation UNEF;
le nombre de filets par inch qui sont recommandes pour
par exemple : l/4-32 UNEF
etre associes avec les dimensions des colonnes 1 et 2. Ces
colonnes de nombre de filets par inch sont divisees en deux
groupes :
3.2 S6ries 5 pas constant (uniforme)
- series a pas croissants : colonnes 4, 5 et 6;
Les combinaisons pas-diametres des filetages des series a pas
-
series a pas constant (uniforme) : colonnes 7 a 14. constant sont toutes designees UN; par exemple : 1-16 UN.
IS0 263-1973 (F)
4 COMBINAISONS DlAMiTRE-PAS
- D iam&tre-pas
TABLEAU 1
Nombre de filets par inch
- - .- ---- _. _- ------ - - -.-.- - -- -. _.-- -~ - --.-_---__- _ _ ._._.____ _.__ --_ ._--- - - - -_.-----
Dia-
Series -a
m*tre
Series a pas constant (uniforme)
pas croissants
Dimen- 1 F’ti
sions
de
base
secon- _ __._ _-- -
princi- /
pales i daires in
UN 1 UN UN 1 UN UN
_-- .--_.- . . _-- ~--~-- - -
No01 10,060 0
80 I
72 /
i No 1 10,073 0 64
j 0,086 0 56 I 64 i
No2/ ’
I j
I
I
- ---- -.- --------- - -.--- - _____.____ ~
1 UNC UNF
1 l/l6 1,062 5
1,125O 7 12 18
1 l/a
-----------
---I. ~--~~
13/16 1,187 5
18 8 12 ( 16 ’ 20 28 1
1,250O 7 12 8 UNFI 16 20 28
1 l/4
l8 i
15/16 1,312 5
* Sele
...

NORME INTERNATIONALE
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXAYHAPOAHA(I OPrAHW3ALV-W l-IO CTAHAAPTW3ALJZ4W.ORGANISATION INTERNATIONALE DE NORMALISATION
Vue d’ensemble et Glection pour
Filetages IS0 en inches -
boulonnerie - DiamGtres de 0,06 B 6 in
Premike bdition - 1973-04-01
Mf. NO : IS0 263-1973 (F)
CDU 621.882.082.2
Descripteurs : Mment de fixation, pas de vis, filet de vis, vis, boulon, krou, dimension, diamhtre, pas de filetage, designation.
Prix bas6 sur 5 pages
AVANT-PROPOS
IS0 (Organisation Internationale de Normalisation) est une federation mondiale
d’organismes nationaux de normalisation (Comites Membres ISO). L’elaboration de
Normes Internationales est confide aux Comites Techniques ISO. Chaque Comite
Membre inter-es& par une etude a le droit de faire partie du Comite Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent egalement aux travaux.
Les Projets de Normes lnternationales adopt& par les Comites Techniques sont
soumis aux Comites Membres pour approbation, avant leur acceptation comme
Normes lnternationales par le Conseil de I’ISO.
Avant 1972, les resultats des travaux des Comites Techniques etaient publies
comme Recommandation ISO; maintenant, ces documents sont en tours de
transformation en Normes lnternationales. Compte tenu de cette procedure, la
Norme Internationale IS0 263 remplace la Recommandation lSO/R 263-1962
etablie par le Comite Technique ISO/TC 1, Filetages.
Les Comites Membres des pays suivants avaient approuve la Recommandation :
Allemagne Finlande
Nouvelle-Zelande
Argentine France
Pays-Bas
Australie Grece
Pologne
Autriche Hongrie Royaume-Uni
Canada lnde Su isse
Chili Israel Tchecoslovaquie
Colombie Italie
U.S.A.
Danemark Japon
Espagne Norvege
desapprouve la Recommandation
Les Comites Membres des pays suivants avaient
pour des raisons techniques
Bulgarie
Suede
U.R.S.S.
0 Organisation internationale de Normalisation, 1973 l
Imprim en Suisse
NORME INTERNATIONALE IS0 263-1973 (F)
Filetages IS0 en inches -
Vue d’ensemble et Aection pour
boulonnerie
- Diametres de 0,06 a 6 in
2.2.1 Shies P pas croissants
1 OBJET ET DOMAINE D’APPLICATION
II y a trois series a pas croissants. Elles sont intitulees ((Pas
La presente Norme Internationale contient les tableaux des
grow, ((Pas fin)) et ((Pas extra-fin)), en accord avec la
filetages IS0 en inches (except6 les filetages pour tubes),
pratique actuelle.
ayant le profil de base triangulaire ISO, selon IS0 68,
.Filetages /SO pour usages ghkaux - Profil de base.
Ces termes indiquent la grandeur relative du pas de trois
Elle comprend a la fois la vue d’ensemble des filetages IS0
series pour chaque diametre don& de filetage et
en inches et les filetages IS0 en inches pour boulonnerie, n’impliquent pas une difference de qualite entre les series.
ces derniers etant une selection des filetages prevus dans la
Les series de filetages a pas gros et fin doivent 8tre choisies
vue d’ensemble.
en premier lieu pour les applications generales de la
Elle donne, pour les diametres de 0,06 a 6 in, diverses series
construction mecanique et elles forment la selection pour la
de combinaisons pas-diametres et egalement un systeme de
boulonnerie commerciale.
designation des f iletages.
I I appartient a chaque industrie de choisir elle-meme, par
2.2.2 Skies 5 pas constant (uniforme)
sklection parmi les filetages de la presente Norme
I nternationale, les combinaisons pas-diametres appropries a
En plus de trois series a pas croissants, le Tableau 1
ses propres besoins.
comprend des colonnes de pas constants qui ont ete choisis
dans la gamme de 4 a 32 filets par inch. Chacune de ces
series est limitee a une gamme appropriee de diametres.
2 SERIES DE FILETAGES
La vue d’ensemble est caracterisee par diverses series de
f i Ietages, c’est-a-dire par des groupes de combinaisons
pas-diametres se distinguant les uns des autres par le
3 DESIGNATION
nombre de filets par inch associes a un diametre donne de
filetage. Ces series de filetages sont donnees dans le
Tableau 1.
Les filetages de cette vue d’ensemble sont design& comme
indique dans les t&es de colonnes du Tableau 1, c’est-a-dire
2.1 Diametres
comme suit :
Les colonnes 1 et 2 du Tableau 1 donnent les dimensions
principales et secondaires devant suffire aux besoins
3.1 Series 5 pas croissants
courants des bureaux d’etude. La colonne 3 donne les
equivalents decimaux de ces dimensions. Serie a pas gros : designation UNC;
: l/4-20 UNC, No 4-40 UNC
par exemple
2.2 Nombre de filets par inch
Serie a pas fin : designation UNF;
par exemple : l/4-28 UNF, No 4-48 UNF
Les colonnes 4 a 14 (inclusivement) du Tableau 1 donnent
Serie a pas extra-fin : designation UNEF;
le nombre de filets par inch qui sont recommandes pour
par exemple : l/4-32 UNEF
etre associes avec les dimensions des colonnes 1 et 2. Ces
colonnes de nombre de filets par inch sont divisees en deux
groupes :
3.2 S6ries 5 pas constant (uniforme)
- series a pas croissants : colonnes 4, 5 et 6;
Les combinaisons pas-diametres des filetages des series a pas
-
series a pas constant (uniforme) : colonnes 7 a 14. constant sont toutes designees UN; par exemple : 1-16 UN.
IS0 263-1973 (F)
4 COMBINAISONS DlAMiTRE-PAS
- D iam&tre-pas
TABLEAU 1
Nombre de filets par inch
- - .- ---- _. _- ------ - - -.-.- - -- -. _.-- -~ - --.-_---__- _ _ ._._.____ _.__ --_ ._--- - - - -_.-----
Dia-
Series -a
m*tre
Series a pas constant (uniforme)
pas croissants
Dimen- 1 F’ti
sions
de
base
secon- _ __._ _-- -
princi- /
pales i daires in
UN 1 UN UN 1 UN UN
_-- .--_.- . . _-- ~--~-- - -
No01 10,060 0
80 I
72 /
i No 1 10,073 0 64
j 0,086 0 56 I 64 i
No2/ ’
I j
I
I
- ---- -.- --------- - -.--- - _____.____ ~
1 UNC UNF
1 l/l6 1,062 5
1,125O 7 12 18
1 l/a
-----------
---I. ~--~~
13/16 1,187 5
18 8 12 ( 16 ’ 20 28 1
1,250O 7 12 8 UNFI 16 20 28
1 l/4
l8 i
15/16 1,312 5
* Sele
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