ISO 725:1978

ISO inch screw threads — Basic dimensions

Filetages ISO en inches — Dimensions de base

Colski vijačni navoji ISO - Osnovne mere

General Information

• Status: Withdrawn
• Publication Date: 31-Oct-1978
• Withdrawal Date: 31-Oct-1978
• ICS: 21.040.20 - Inch screw threads
• Technical Committee: ISO/TC 1 - Screw threads
• Drafting Committee: ISO/TC 1 - Screw threads
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 27-Jan-2000
• Ref Project: SIST ISO 725:1997 - ISO inch screw threads -- Basic dimensions

Relations

• Revised: ISO 725:2009 - ISO inch screw threads — Basic dimensions
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL STAND/Ml
725
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME~YHAPO~HAR OPrAHl43ALWlR IlO CTAH~APTbl3A~blM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
IS0 inch screw threads - Basic dimensions
Filetages /SO en inches - Dimensions de base
First edition - 1978-1 l-l 5
-
w UDC 621.882.082.2
Ref. No. IS0 725-1978 (E)
-
F?
cn
P
Descriptors : screw threads, IS0 screw threads, inch screw threads, dimensions.
Price based on 5 pages

---------------------- Page: 1 ----------------------
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.
International Standard IS0 725 was developed by Technical Committee lSO/TC 1,
Screw threads.
It was submitted directly to the IS0 Council, in accordance with clause 6.13.1 of
the Directives for the technical work of ISO. It cancels and replaces IS0 Recom-
mendation R 725-1968, which had been approved by the member bodies of the
following countries :
France South Africa, Rep. of
Australia
Austria Hungary Spain
Belgium India Sweden
Brazil Israel Switzerland
Canada Japan Turkey
Chile Netherlands United Kingdom
New Zealand U.S.A.
Czechoslovakia
Norway Yugoslavia
Denmark
Egypt, Arab Rep. of Poland
Finland Romania
of the
The member body of the foll owin g country had exp disapproval
docu ment on technical grounds
Germany, F.R.
@ International Organization for Standardization, 1978 l
Printed in Switzerland

---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD IS0 725-1978 (E)
IS0 inch screw threads - Basic dimensions
1 SCOPE AND FIELD OF APPLICATION D = basic major diameter of internal thread
This International Standard specifies the basic dimensions, d = basic major diameter of external thread
in inches, of IS0 inch screw threads according to IS0 263,
= basic pitch diameter of internal thread
IS0 inch screw threads - General plan and selection for D2
screws, bolts and nuts - Diameter range 0.06 to 6 in. The d
= basic pitch diameter of external thread
2
values refer to the basic profile according to IS0 68,
= basic minor diameter of internal thread
/SO general purpose screw threads - Basic profile.
D,
= basic minor diameter of external thread
d,
H = height of fundamental triangle
n = number of threads per inch (25,4 mm)
The values of D,, d,, D, and d, have been calculated from
the following formulae and rounded, in the tables, to the
2 BASIC DIMENSIONS fourth decimal place :
3 0.649 519
=D-2x-H-D--
D2
8 n
3 0.649 519
=&-2x-H=d-
d2
8 n
5 1.082 532
=D-2x-H-D---
D,
8 n
5 1.082 532
=d-2x-H=d-
d,
8 n

---------------------- Page: 3 ----------------------
IS0 725-1978 (E)
Number
Number
Pitch Minor Major Pitch Minor
Major
of threads
of threads
diameter diameter diameter diameter dimeter
diameter Size
Size
per inch
per inch
n
n D, d
Dfd
D, f d, D2f d2 D, ’ d,
0.051 9 0.046 5 32 0.542 2 0.528 7
No. 0 80 0.06
28 0.539 3 0.523 8
0.058 0
72 0.064 0
24 0.535 4 0.517 4
No.1 0.073
0.056 1
64 0.062 9
9116 20 0.562 5 0.530 0 0.508 4
0.526 4 0.502 4
18
0.069 1
64 0.075 9
No.2 0.086
16 0.5219 0.494 8
0.066 7
56 0.074 4
0.508 4
12 0.472 3
0.079 7
56 0.087 4
32 0.604 7 0.591 2
No.3 0.099
48 0.085 5 0.076 4 28 0.601 8 0.586 3
24 0.597 9 0.579 9
48 0.098 5 0.089 4
No.4 0.112 20 0.592 5 0.570 9
0.084 9 518 0.625
40 0.095 8
18 0.588 9 0.564 9
44 0.110 2 0.100 4
16 0.584 4 0.557 3
No.5 0.125
40 0.108 8 0.097 9 12 0.570 9 0.534 8
11 0.566 0 0.526 6
40 0.121 8 0.110 9
No.6 0.138
32 0.667 2 0.653 7
32 0.117 7 0.104 2
28 0.664 3 0.648 8
0.133 9
36 0.146 0
24 OS60 4 0.642 4
No.8
0.164
WI6 0687 5
0.143 7 0.130 2
32
0.655 0 0.633 4
20
0.646 9
16 0.619 8
32 0.169 7 0.156 1
No.10 0.19
12 0.633 4 0.597 3
24 0.162 9 0.144 9
0.729 7
32 0.716 2
32 0.195 7 0.182 2
28 0.726 8 0.711 3
No.12 28 0216 0.192 8 0.177 3
0.717 5
20 0.695 9
24 0.188 9 0.170 9 314 0.75
0.709 4 0.682 3
16
32 0229 7 0.216 2 12 0695 9 0.659 8
10 0.685 0 0.641 7
l/4 28 025 0.226 8 0.211 3
20 0217 5 0.195 9
32 0.792 2 0.778 7
28 0.789 3 0.773 8
32 0292 2 0.278 7
13/16 20 0.812 5 0.780 0 0.758 4
28 0289 3 0.273 8
16 0.771 9 0.744 8
5116 24 0.312 5 0285 4 0.267 4
12 0.758 4 0.722 3
20 0280 0 0.258 4
0.854 7
32 0.8412
18 0276 4 0.252 4
28 0.8518
0.836 3
32 0354 7 0.341 2
20 0.842 5 0.820 9
28 0.3518 0.336 3 718 16 0875 0.834 4 0.807 3
14 0.828 6 0.797 7
318 24 0375 0.347 9 0.329 9
12 0.820 9 0.784 8
20 0342 5 0.320 9
9 0.802 8 0.754 7
0.307 3
16 03344
0.917 2
32 0.903 7
32 0.417 2 0.403 7
28
0.914 3 0.898 8
28 0.414 3 0.398 8
15/16 20 0.937 5 0305 0
0.883 4
7116 20 0.437 5 0.405 0 0.383 4
16 0.896 9
0.869 8
16 0396 9 0.369 8
12 0.883 4
0.847 3
14 0.391 1 0.360 2
32 0.979 7
0.966 2
32 0.479 7
0.466 2
28 0376 8
0.961 3
28 0.476 8 0.461 3
20 0.967 5 0.945 9
1 1
II2 20 05 0.467 5 0.445 9 0.959 4
16 0.932 3
16 0.459 4 0.432 3 12
0345 9 0309 8
13 0.450 0 0.416 7 8
0.918 8 0.864 7

---------------------- Page: 4 ----------------------
IS0 7254978 (E)
~~ ~~
Number Number
Minor Pitch Minor
Major Pitch Major
of threads of threads
diameter diameter diameter diameter diameter
diameter
Size Size
per inch
per inch
n
n D, d
D, d Dl’ dl
Dl' dl D2f d2
28 1.0393 1.023 8 20 1.5300 1.5084
20 1.0300 1.0084
1.5264 1.5024
18
18 1.0264 1.0024
1.521 9 1.494 8
16
1 l/116 1.062 5
1.562 5
1.021 9 0.994 8 1 9116
...

SLOVENSKI STANDARD
SIST ISO 725:1997
01-maj-1997
&ROVNLYLMDþQLQDYRML,622VQRYQHPHUH
ISO inch screw threads -- Basic dimensions
Filetages ISO en inches -- Dimensions de base
Ta slovenski standard je istoveten z: ISO 725:1978
ICS:
21.040.20 Colski navoji Inch screw threads
SIST ISO 725:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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

SIST ISO 725:1997

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

SIST ISO 725:1997
INTERNATIONAL STAND/Ml
725
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME~YHAPO~HAR OPrAHl43ALWlR IlO CTAH~APTbl3A~blM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
IS0 inch screw threads - Basic dimensions
Filetages /SO en inches - Dimensions de base
First edition - 1978-1 l-l 5
-
w UDC 621.882.082.2
Ref. No. IS0 725-1978 (E)
-
F?
cn
P
Descriptors : screw threads, IS0 screw threads, inch screw threads, dimensions.
Price based on 5 pages

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

SIST ISO 725:1997
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.
International Standard IS0 725 was developed by Technical Committee lSO/TC 1,
Screw threads.
It was submitted directly to the IS0 Council, in accordance with clause 6.13.1 of
the Directives for the technical work of ISO. It cancels and replaces IS0 Recom-
mendation R 725-1968, which had been approved by the member bodies of the
following countries :
France South Africa, Rep. of
Australia
Austria Hungary Spain
Belgium India Sweden
Brazil Israel Switzerland
Canada Japan Turkey
Chile Netherlands United Kingdom
New Zealand U.S.A.
Czechoslovakia
Norway Yugoslavia
Denmark
Egypt, Arab Rep. of Poland
Finland Romania
of the
The member body of the foll owin g country had exp disapproval
docu ment on technical grounds
Germany, F.R.
@ International Organization for Standardization, 1978 l
Printed in Switzerland

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

SIST ISO 725:1997
INTERNATIONAL STANDARD IS0 725-1978 (E)
IS0 inch screw threads - Basic dimensions
1 SCOPE AND FIELD OF APPLICATION D = basic major diameter of internal thread
This International Standard specifies the basic dimensions, d = basic major diameter of external thread
in inches, of IS0 inch screw threads according to IS0 263,
= basic pitch diameter of internal thread
IS0 inch screw threads - General plan and selection for D2
screws, bolts and nuts - Diameter range 0.06 to 6 in. The d
= basic pitch diameter of external thread
2
values refer to the basic profile according to IS0 68,
= basic minor diameter of internal thread
/SO general purpose screw threads - Basic profile.
D,
= basic minor diameter of external thread
d,
H = height of fundamental triangle
n = number of threads per inch (25,4 mm)
The values of D,, d,, D, and d, have been calculated from
the following formulae and rounded, in the tables, to the
2 BASIC DIMENSIONS fourth decimal place :
3 0.649 519
=D-2x-H-D--
D2
8 n
3 0.649 519
=&-2x-H=d-
d2
8 n
5 1.082 532
=D-2x-H-D---
D,
8 n
5 1.082 532
=d-2x-H=d-
d,
8 n

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

SIST ISO 725:1997
IS0 725-1978 (E)
Number
Number
Pitch Minor Major Pitch Minor
Major
of threads
of threads
diameter diameter diameter diameter dimeter
diameter Size
Size
per inch
per inch
n
n D, d
Dfd
D, f d, D2f d2 D, ’ d,
0.051 9 0.046 5 32 0.542 2 0.528 7
No. 0 80 0.06
28 0.539 3 0.523 8
0.058 0
72 0.064 0
24 0.535 4 0.517 4
No.1 0.073
0.056 1
64 0.062 9
9116 20 0.562 5 0.530 0 0.508 4
0.526 4 0.502 4
18
0.069 1
64 0.075 9
No.2 0.086
16 0.5219 0.494 8
0.066 7
56 0.074 4
0.508 4
12 0.472 3
0.079 7
56 0.087 4
32 0.604 7 0.591 2
No.3 0.099
48 0.085 5 0.076 4 28 0.601 8 0.586 3
24 0.597 9 0.579 9
48 0.098 5 0.089 4
No.4 0.112 20 0.592 5 0.570 9
0.084 9 518 0.625
40 0.095 8
18 0.588 9 0.564 9
44 0.110 2 0.100 4
16 0.584 4 0.557 3
No.5 0.125
40 0.108 8 0.097 9 12 0.570 9 0.534 8
11 0.566 0 0.526 6
40 0.121 8 0.110 9
No.6 0.138
32 0.667 2 0.653 7
32 0.117 7 0.104 2
28 0.664 3 0.648 8
0.133 9
36 0.146 0
24 OS60 4 0.642 4
No.8
0.164
WI6 0687 5
0.143 7 0.130 2
32
0.655 0 0.633 4
20
0.646 9
16 0.619 8
32 0.169 7 0.156 1
No.10 0.19
12 0.633 4 0.597 3
24 0.162 9 0.144 9
0.729 7
32 0.716 2
32 0.195 7 0.182 2
28 0.726 8 0.711 3
No.12 28 0216 0.192 8 0.177 3
0.717 5
20 0.695 9
24 0.188 9 0.170 9 314 0.75
0.709 4 0.682 3
16
32 0229 7 0.216 2 12 0695 9 0.659 8
10 0.685 0 0.641 7
l/4 28 025 0.226 8 0.211 3
20 0217 5 0.195 9
32 0.792 2 0.778 7
28 0.789 3 0.773 8
32 0292 2 0.278 7
13/16 20 0.812 5 0.780 0 0.758 4
28 0289 3 0.273 8
16 0.771 9 0.744 8
5116 24 0.312 5 0285 4 0.267 4
12 0.758 4 0.722 3
20 0280 0 0.258 4
0.854 7
32 0.8412
18 0276 4 0.252 4
28 0.8518
0.836 3
32 0354 7 0.341 2
20 0.842 5 0.820 9
28 0.3518 0.336 3 718 16 0875 0.834 4 0.807 3
14 0.828 6 0.797 7
318 24 0375 0.347 9 0.329 9
12 0.820 9 0.784 8
20 0342 5 0.320 9
9 0.802 8 0.754 7
0.307 3
16 03344
0.917 2
32 0.903 7
32 0.417 2 0.403 7
28
0.914 3 0.898 8
28 0.414 3 0.398 8
15/16 20 0.937 5 0305 0
0.883 4
7116 20 0.437 5 0.405 0 0.383 4
16 0.896 9
0.869 8
16 0396 9 0.369 8
12 0.883 4
0.847 3
14 0.391 1 0.360 2
32 0.979 7
0.966 2
32 0.479 7
0.466 2
28 0376 8
0.961 3
28 0.476 8 0.461 3
20 0.967 5 0.945 9
1 1
II2 20 05 0.467 5 0.445 9 0.959 4
16 0.932 3
16 0.459 4 0.432 3 12
0345 9 0309 8
13 0.450 0 0.416 7 8
0.918 8 0.864 7

---------------------- Page: 6 ----------------------

SIST ISO 725:1997
IS0 7254978 (E)
~~ ~~
Number Number
...

E
NORME INTERNATIONALE 725
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEWYHAPO,lHAR OPrAHM3AUMR no CTAH,lAPTM3AUMM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Filetages IS0 en inches - Dimensions de base
IS0 inch screw threads - Basic dimensions
Première édition - 1978-1 1-15
'-
A
U CDU 621.882.082.2 Réf. no : IS0 725-1978 (FI
-
Descripteun : filetage, filetage ISO, filetage en inches, dimension.
ri>
N
I-
;
Prix basé sur 5 pages

---------------------- Page: 1 ----------------------
AVANT-PROPOS
L'ISO (Organisation internationale de normalisation) est une fédération mondiale
d'organismes nationaux de normalisation (comités membres de I'ISO). L'élaboration
est confiée aux comités techniques de I'ISO. Chaque
des Normes internationales
comité membre intéressé par une étude a le droit de faire partie du comité technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I'ISO, participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont
soumis aux comités membres pour approbation, avant leur acceptation comme
Normes internationales par le Conseil de I'ISO.
La Norme internationale IS0 725 a été élaborée par le comité technique ISO/TC 1,
Filetages .
Elle fut soumise directement au Conseil de I'ISO, conformément au para-
graphe 6.13.1 des Directives pour les travaux techniques de I'ISO. Elle annule et
remplace la Recommandation ISO/R 725-1968, qui avait été approuvée par les
comités membres des pays suivants :
Afrique du Sud, Rép. d' Finlande Roumanie
Australie France Royaume-Uni
Autriche Hongrie Suède
Belgique Inde Suisse
Brésil Israël Tchécoslovaquie
Turquie
Canada Japon
Chili Norvège U.S.A.
Danemark Nouvelle-Zélande Yougoslavie
Égypte, Rép. arabe d' Pays-Bas
Espagne Pologne
Le comité membre du pays suivant l'avait désapprouvée pour des raisons
techniques :
Allemagne, R.F.
O Organisation internationale de normalisation, 1978
Imprimé en Suisse

---------------------- Page: 2 ----------------------
NORME INTERNATIONALE IS0 725-1978 (F)
Filetages IS0 en inches - Dimensions de base
1 OBJET ET DOMAINE D'APPLICATION D = diamètre extérieur de base du filetage intérieur
La présente Norme internationale fixe les dimensions de d = diamètre extérieur de base du filetage extérieur
base, en inches, des filetages IS0 en inches conformes à
D, = diamètre sur flancs de base du filetage intérieur
I'ISO263, Filetages IS0 en inches - Vue d'ensemble et
sélection pour boulonnerie - Diamètres de 0,06 à 6 in. Les
d, = diamètre sur flancs de base du filetage extérieur
dimensions se réfèrent au profil de base conforme à
D, = diamètre intérieur de base du filetage intérieur
I'ISO 68, Filetages IS0 pour usages généraux - Profil de
base.
d, = diamètre intérieur de base du filetage extérieur
H = hauteur du triangle générateur
n = nombre de filets par inch (25,4 mm)
Les valeurs des diamètres D,, d,, D,, et d, ont été
calculées à l'aide des formules suivantes, et arrondies, dans
2 DIMENSIONS DE BASE
les tableaux, à la quatrième décimale :
3 0,649 5 19
D, = D- 2 x - H 1 D -
8 n
3 0,649 519
d, =d-2 x-H=d-
8 n
5 1,082 532
D, 1 D- 2 x-H = D -
8 n
d, =d-2x-H=d- 5 1,082 532
8 n
1

---------------------- Page: 3 ----------------------
I
IS0 725-1978 (F)
~~
Nombre
Diamètre Diamètre
Diamètre Diamètre Dia mètre
de filets
sur flancs intérieur
Désignation extérieur sur flancs intérieur
par inch
n
D, d
D2. d2 Dl rd1
D2, d2 Dl I dl
0,051 9 0,046 5
32 0,542 2 0,528 7
28 0,539 3 0,523 8
0,064 O 0,058 O
24 0,535 4 0,517 4
0,062 9 0,056 1
911 6 20 0,562 5 0,530 O 0,508 4
18 0.526 4 0,502 4
0,075 9 0,069 1
16 0,521 9 0,494 8
0,074 4 0,066 7
12 0,508 4 0,472 3
0,087 4 0,079 7
32 0,604 7
0,591 2
0,085 5 0,076 4
28 0,601 8
0,586 3
24 0,597 9
0,579 9
0,098 5 0,089 4
20
518 0,592 5 0,570 9
0,095 8 0,084 9
0,625
18
0,588 9 0,564 9
0.1 10 2 0,1004
16 0,584 4
0,557 3
0,108 8
0,097 9 12 0,570 9
0,534 8
11
0,566 O 0,526 6
0,121 8 0.1 10 9
32 0,667 2 7
0,653
0.1 17 7 0,104 2
28 0,648 8
0,664 3
0,146 O
0,133 9
24
0,660 4 0,642 4
11/16 0,687 5
0,143 7 0,130 2
O
20 0,655 0.633 4
0,169 7 0,156 1 16 0.646 9 0,619 8
12 0,633 4 0,597 3
0,162 9 0,144 9
32
0,729 7 0,716 2
0,195 7 0,182 2
28 0,726 8 0,711 3
0,192 8 0.1 77 3
20 0,717 5
0,695 9
0,188 9 0,170 9 0.75
314
16 0,709 4 0,682 3
7
0,229 0,216 2
12 0,695 9 0,659 8
0,226 8 0,211 3
10 0,685 O 0,641 7
0,217 5 0,195 9
32 0.792 2 0,778 7
28 0,785 3 0,773 8
0,292 2 0,278 7
1311 6 20 0,812 5
0,780 O 0.758 4
0,289 3 0,273 8
16 0,771 9 0,744 8
0.285 4
0,267 4
12 0,758 4 0,722 3
0,280 O 0,258 4
32 0,854 7 0,841 2
0,276 4 0,252 4
~~
28 0,851 8 0,836 3
0,354 7
0,341 2
20 0,842 5 0,820 9
0,351 8
0,336 3
718 16 0,875 0,834 4 0,807 3
0.347 9 0,329 9
14 0,828 6 0,797 7
0,342 5 0,320 9
12 0.820 9 0,784 8
0,334 4 9 0,802 8 0,754 7
0,307 3
32 0,917 2 0,903 7
0,417 2 7
0,403
28 0,914 3 0,898 8
0,414 3 0,398 8
1 511 6 20
0,937 5 0,905 O 0,883 4
0,405 O
0,383 4
16 0,896 9 0,869 8
0,396 9
0,369 8
12
0,883 4 0,847 3
0,391 1 0,360 2
32
0,979 7 0,966 2
0,479 7 0,466 2
28 0,976 8
0,961 3
0.476 8
0.461 3
20 5
0,967 0,945 9
1 1
0.467 5
0.445 9 16 0,959 4 0,932 3
0.459 4
0.432 3 12 0,945 9 0,909 8
0.450 O 7
0.416 8 0,918 8 0,864 7
I I I
2

---------------------- Page: 4 ----------------------
IS0 725-1978 (F)
Nombre
Nombre
Diamètre Diamètre Diamètre
Diamètre Diamètre
Diamètre
de filets
de filets
extérieur sur flancs intérieur
)&gnation extérieur sur flancs
lésignation intérieur
par inch
par inch
n
D, d n
D2, d2 Dl ' dl D, d
D2, d2 Dl ' d,
1,039 3 1,023 8
28
20 1,530 O 1,508 4
1,030 O 1,008 4
20
18 1,526 4 1,502 4
1,026 4 1,002 4
18
1 .O62 5 16 1,521 9 1,494 8
11116
1,021 9 0,994 8
16
1 9/16 1,562 5
12 1,508 4 1,472 3
12 1,008 4 0,972 3
8 1,481 3 1,427 2
8 0,981 3 0,927 2
6 1,454 2 1,382 1
28 1,101 8 1,086 3
1,070 9
20 1,092 5
20 1,592 5 1,570 9
1,
...