ISO 3508:1976

Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262

Specifies for fully threaded screws with machined, or rolled threads pitches of the thread ranging from 0,2 mm to 6 mm and thread diameters (coarse thread) ranging from 1 mm to 68 mm; it does not apply to those threaded fasteners where special requirements are laid down in the product standards.

Filets incomplets pour les éléments de fixation avec un filetage selon ISO 261 et ISO 262

Izteki navojev za vezne elemente z metrskim navojem ISO (po ISO 261 in ISO 262)

General Information

• Status: Published
• Publication Date: 31-Jan-1976
• ICS: 21.060.01 - Fasteners in general
• Technical Committee: ISO/TC 2/SC 7 - Reference standards
• Drafting Committee: ISO/TC 2/SC 7 - Reference standards
• Current Stage: 9092 - International Standard to be revised
• Start Date: 23-Jul-2025
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 3508:1996 - Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262

Overview

ISO 3508:1976 is an international standard published by the International Organization for Standardization (ISO) that specifies the thread run-outs for fasteners with threads manufactured according to ISO 261 and ISO 262. This standard covers fully threaded screws with machined or rolled threads, focusing on thread pitches ranging from 0.2 mm to 6 mm and thread diameters (coarse thread) from 1 mm to 68 mm. It is intended for general applications involving screws, bolts, and nuts but excludes threaded fasteners that have special requirements defined in their specific product standards.

The scope of ISO 3508:1976 ensures consistent thread run-out dimensions to maintain mechanical integrity and reliable performance of metric threaded fasteners in various industrial applications.

Key Topics

• Thread Run-Out Definition: Specifies the geometrical transition where the threads end on fully threaded screws to avoid sharp edges or weak points.
• Compatibility: Applies to fasteners threaded in compliance with ISO 261 (General Plan for Metric Screw Threads) and ISO 262 (General Purpose Metric Screw Threads - Selected Sizes).
• Thread Types: Covers both machined and rolled threads, ensuring dimensional accuracy for different manufacturing methods.
• Dimensional Limits: Provides detailed dimensions for run-out lengths and distances, differentiated by thread pitch and diameter size.
• Thread Pitch and Diameter Range:
  • Pitch: 0.2 mm to 6 mm
  • Diameter: 1 mm to 68 mm (coarse thread)
• Product Grades: Specifies different run-out distances based on fastener grades (A, B, and C) and technical requirements for short or normal run-outs.

Applications

ISO 3508:1976 is essential for ensuring the mechanical strength and fatigue resistance of fully threaded screws, bolts, and nuts used in manufacturing, construction, automotive, aerospace, and machinery industries. Proper thread run-out designs help:

• Reduce stress concentrations at thread ends, preventing premature failure.
• Facilitate smooth assembly by avoiding thread damage during installation.
• Enhance compatibility of fasteners manufactured to ISO metric thread sizes.
• Maintain interchangeability across international markets by adhering to consistent thread run-out standards.

Design engineers, fastener manufacturers, and quality control professionals rely on ISO 3508 to deliver robust threaded components that meet international quality expectations.

Related Standards

• ISO 261: Specifies the general plan for metric screw threads and defines thread profiles and dimensions.
• ISO 262: Defines selected sizes of general-purpose metric screw threads for screws, bolts, and nuts.
• ISO 4032: Pertains to hexagon nuts with metric ISO threads, often used together with ISO 3508 fasteners.
• ISO 4762: Defines hexagon socket head cap screws, which may incorporate thread run-outs per ISO 3508.
• ISO 898-1: Standardizes mechanical properties of fasteners made of carbon steel and alloy steel.

---

By complying with ISO 3508:1976, stakeholders in fastener production and application can ensure consistent thread run-out dimensions, improving product reliability and facilitating global standardization of metric threaded fasteners. This contributes to safer designs and effective maintenance across diverse industries.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-1996
Izteki navojev za vezne elemente z metrskim navojem ISO (po ISO 261 in ISO 262)
Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262
Filets incomplets pour les éléments de fixation avec un filetage selon ISO 261 et ISO 262
Ta slovenski standard je istoveten z: ISO 3508:1976
ICS:
21.040.10 Metrski navoji Metric screw threads
21.060.01 Vezni elementi na splošno Fasteners in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

~~
INTERNATIONAL STANDARD 3508
.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l EWiYHAPOllHAR OPI-AHM3AUWII no CTAH~APTH3AUMH.ORGANISATION INTERNATIONALE DE NORMALISATION
Thread run-outs for fasteners with thread in accordance
with IS0 261 and IS0 262
Filets imompks pour les &ments ’de fixation avec un filetage selon IS0 261 et IS0 262
First edition - 1976-02-01
Ref. No. IS0 35084976 (E)
UDC 621.882.082.1
Descriptors : screws, screw threads, thread run-out, metric system.
Price based on 3 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.
International Standard IS0 3508 was drawn up by Technical Committee lSO/TC 2,
Fasteners, and circulated to the Member Bodies in September 1974.
It has been approved by the Member Bodies of the following countries :
Australia . Romania
Germany
South Africa, Rep. of
Austria Hungary
Sweden
Belgium India
Switzerland
Bulgaria Ireland
Turkey
Canada New Zealand
United Kingdom
Chile Norway
Denmark Poland U.S.S:R.
Yugoslavia
Finland Portugal
pressed disapproval of the
The Member Bodies of the fol lowing countries ex
grounds :
document on
...

~~
INTERNATIONAL STANDARD 3508
.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l EWiYHAPOllHAR OPI-AHM3AUWII no CTAH~APTH3AUMH.ORGANISATION INTERNATIONALE DE NORMALISATION
Thread run-outs for fasteners with thread in accordance
with IS0 261 and IS0 262
Filets imompks pour les &ments ’de fixation avec un filetage selon IS0 261 et IS0 262
First edition - 1976-02-01
Ref. No. IS0 35084976 (E)
UDC 621.882.082.1
Descriptors : screws, screw threads, thread run-out, metric system.
Price based on 3 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.
International Standard IS0 3508 was drawn up by Technical Committee lSO/TC 2,
Fasteners, and circulated to the Member Bodies in September 1974.
It has been approved by the Member Bodies of the following countries :
Australia . Romania
Germany
South Africa, Rep. of
Austria Hungary
Sweden
Belgium India
Switzerland
Bulgaria Ireland
Turkey
Canada New Zealand
United Kingdom
Chile Norway
Denmark Poland U.S.S:R.
Yugoslavia
Finland Portugal
pressed disapproval of the
The Member Bodies of the fol lowing countries ex
grounds :
document on technical
France
Italy
U.S.A.
0 International Organization for Standardization, 1976 l
Printed in Switzerland
ISO3508-1976 (E)
INTERNATIONAL STANDARD
Thread run-outs for fasteners with thread in accordance
with IS0 261 and IS0 262
I SCOPE AND FIELD OF APPLICATION
This International Standard specifies thread run-outs for fasteners
...

NORME INTERNATIONALE.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .ME)KaYHAPOfiHAII OPTAHM3ALWI l-I0 CTAHflAPTM3ALWWi .ORGANISATION INTERNATIONALE DE NORMALISATION
Filets incomplets pour.les éléments de fixation avec un
filetage selon ISO 261 et ISO 262
Thread mn-outs for fasteners with thread in accordance with /SO 267 and /SO 262
Première édition - 1976-02-01
Réf. n* : ISO 35084976 (F)
CDU 621.882.082.1
filet incomplet, système métrique.
Descripteurs : vis, filetage,
Prix basé sur 3 pages
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres ISO). L’élaboration de
Normes Internationales est confiée aux Comités Techniques ISO. Chaque 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 ISO 3508 a été établie par le Comité Technique lSO/TC 2,
Éléments de fixation, et soumise aux Comités Membres en septembre 1974.
Elle a été approuvée par les Comités Membres des pays suivants I
Afrique du Sud, Rép. d’ Danemark Portugal
Al lemagne Finlande Roumanie
Australie Hongrie Royaume-Uni
Autriche Inde Suède
Belgique Irlande Suisse
Bulgarie
Norvège Turquie
Canada
Nouvelle-Zélande U.R.S.S.
Chili Yougoslavie
Pologne
Les Comités Membres des pays suivants ont désapprouvé le document pour des
raisons techniques :
France
Italie
U.S.A.
0 Organisation Internationale de Normalisation, 1976 l
I mpr i mé en Suisse
ISO3508=1976(F)
NORME INTERNATIONALE
Filets incomplets pour les éléments de fixation avec un
filetage selon ISO 261 et ISO 262
1 OBJET ET DOMAINE D’APPLICATION
La présente Norme Internationale spécifie les filets incomplets pour les éléments de fixation avec un filetage selon ISO 261,
Filetages métriqu
...

NORME INTERNATIONALE.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .ME)KaYHAPOfiHAII OPTAHM3ALWI l-I0 CTAHflAPTM3ALWWi .ORGANISATION INTERNATIONALE DE NORMALISATION
Filets incomplets pour.les éléments de fixation avec un
filetage selon ISO 261 et ISO 262
Thread mn-outs for fasteners with thread in accordance with /SO 267 and /SO 262
Première édition - 1976-02-01
Réf. n* : ISO 35084976 (F)
CDU 621.882.082.1
filet incomplet, système métrique.
Descripteurs : vis, filetage,
Prix basé sur 3 pages
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres ISO). L’élaboration de
Normes Internationales est confiée aux Comités Techniques ISO. Chaque 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 ISO 3508 a été établie par le Comité Technique lSO/TC 2,
Éléments de fixation, et soumise aux Comités Membres en septembre 1974.
Elle a été approuvée par les Comités Membres des pays suivants I
Afrique du Sud, Rép. d’ Danemark Portugal
Al lemagne Finlande Roumanie
Australie Hongrie Royaume-Uni
Autriche Inde Suède
Belgique Irlande Suisse
Bulgarie
Norvège Turquie
Canada
Nouvelle-Zélande U.R.S.S.
Chili Yougoslavie
Pologne
Les Comités Membres des pays suivants ont désapprouvé le document pour des
raisons techniques :
France
Italie
U.S.A.
0 Organisation Internationale de Normalisation, 1976 l
I mpr i mé en Suisse
ISO3508=1976(F)
NORME INTERNATIONALE
Filets incomplets pour les éléments de fixation avec un
filetage selon ISO 261 et ISO 262
1 OBJET ET DOMAINE D’APPLICATION
La présente Norme Internationale spécifie les filets incomplets pour les éléments de fixation avec un filetage selon ISO 261,
Filetages métriqu
...