EN ISO 2702:2022

Fasteners - Heat treated tapping screws - Mechanical and physical properties (ISO 2702:2022)

This document specifies the mechanical and physical properties of heat treated tapping screws made of steel, with thread sizes ST2,2 to ST9,5 in accordance with ISO 1478, when tested at the ambient temperature range of 10 °C to 35 °C, and the related test methods.
Tapping screws are designed to form mating threads in sheet metals, without their own threads being deformed. Tapping screws are not intended to be pretensioned by design, even though they can experience varying degrees of low-level tensile stress after installation.

Mechanische Verbindungselemente - Wärmebehandelte Blechschrauben - Mechanische und physikalische Eigenschaften (ISO 2702:2022)

Dieses Dokument legt die mechanischen und physikalischen Eigenschaften von wärmebehandelten Blechschrauben aus Stahl mit Gewindegrößen von ST2,2 bis ST9,5 nach ISO 1478 fest, wenn sie im Umgebungstemperaturbereich von 10 °C bis 35 °C geprüft werden, sowie die zugehörigen Prüfverfahren.
Blechschrauben sind so ausgelegt, dass sie in Metallblechen Gegengewinde formen, ohne dass dabei ihre eigenen Gewinde verformt werden. Blechschrauben sind konstruktiv nicht dafür vorgesehen, vorgespannt zu werden, auch wenn sie nach der Montage mehr oder weniger starken Zugspannungen ausgesetzt sein können.

Fixations - Vis à tôle traitées thermiquement - Caractéristiques mécaniques et physiques (ISO 2702:2022)

Le présent document spécifie les caractéristiques mécaniques et physiques des vis à tôle traitées thermiquement, en acier, de diamètre de filetage ST2,2 à ST9,5 conformément à l'ISO 1478, lorsqu’elles sont soumises à essai dans la plage de température ambiante de 10 °C à 35 °C, ainsi que les méthodes d'essai correspondantes.
Les vis à tôle sont conçues pour former leur taraudage lors du vissage dans des matériaux métalliques minces (tôles), sans déformation de leur propre filetage. Les vis à tôle ne sont intrinsèquement pas prévues pour être mises sous tension, même si quelques contraintes de traction de faible niveau peuvent être présentes après leur installation.

Vezni elementi - Toplotno obdelani pločevinski vijaki - Mehanske in fizikalne lastnosti (ISO 2702:2022)

Ta dokument določa mehanske in fizikalne lastnosti toplotno obdelanih pločevinskih vijakov iz jekla, z velikostjo navoja od ST 2,2 do ST 9,5 v skladu s standardom ISO 1478, pri preskušanju pri temperaturi okolja od 10 °C do 35 °C ter povezane preskusne metode.
Pločevinski vijaki so zasnovani tako, da tvorijo parne navoje v pločevini, ne da bi se njihovi navoji deformirali. Pločevinski vijaki po svoji zasnovi niso predvideni za prednapenjanje, čeprav lahko po namestitvi doživijo različne stopnje nizke natezne napetosti.

General Information

• Status: Published
• Publication Date: 20-Dec-2022
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Drafting Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Dec-2022
• Completion Date: 21-Dec-2022
• Ref Project: SIST EN ISO 2702:2023 - Fasteners - Heat treated tapping screws - Mechanical and physical properties (ISO 2702:2022)

Relations

• Replaces: EN ISO 2702:2011 - Heat-treated steel tapping screws - Mechanical properties (ISO 2702:2011)
• Effective Date: 08-Apr-2020

Overview

EN ISO 2702:2022 - Fasteners: Heat treated tapping screws - Mechanical and physical properties defines the required mechanical and physical characteristics and the associated test methods for heat‑treated steel tapping screws with thread sizes ST2,2 to ST9,5 (ISO 1478). Applicable when tested at ambient temperatures of 10 °C to 35 °C, the standard covers tapping screws designed to form mating threads in sheet metal (without deforming their own threads) and that are not intended to be pretensioned.

Key facts:

• Published December 2022 and adopted by CEN as EN ISO 2702:2022.
• Supersedes the 2011 edition; includes updated requirements and new test/inspection clauses.
• Materials: cold‑heading steels suitable for case‑hardening (see referenced standards such as ISO 4954).

Key Topics and Requirements

• Mechanical and physical properties: Specified properties include surface hardness, case‑hardened depth (CHD), core hardness, microstructure, thread‑forming ability, torsional strength and ductility.
• Surface hardness: Minimum specified surface hardness after heat treatment is 450 HV 0,3. A purchaser may request a maximum surface hardness to reduce environmental hydrogen embrittlement risk.
• Case‑hardened depth (CHD): Values and limits for CHD are given by thread size in the standard (see Clause 5.3 and Table 2).
• Core hardness and microstructure: Core hardness limits and microstructure requirements with Vickers testing and metallographic checks (referenced ISO 6507‑1).
• Test methods (Clause 6): Includes surface hardness test, CHD determination, core hardness test, microstructure examination, drive/ thread‑forming test, torsional strength test and ductility test.
• Inspection and conformity: New Clause 7 defines manufacturer, supplier and purchaser inspection responsibilities; Clause 8 prescribes marking and labelling requirements.

Practical Applications

• Ensures consistent quality and performance of heat‑treated tapping screws used in sheet‑metal assemblies across automotive, appliance, construction, electronics and general manufacturing.
• Helps fastener manufacturers implement standard production controls and test regimes.
• Used by purchasing/specification engineers to define acceptance criteria for supplied fasteners.
• Useful for independent testing laboratories and quality assurance teams performing conformity testing.

Who Should Use It

• Fastener manufacturers and heat‑treaters
• OEMs and component manufacturers specifying tapping screws
• Quality/control engineers and inspection labs
• Procurement teams writing technical specifications

Related Standards

• ISO 1478 (Tapping screws thread)
• ISO 6507‑1 (Vickers hardness test)
• ISO 1891‑4 (Fasteners - Vocabulary: inspection and acceptance)
• ISO 16228 (Types of inspection documents)
• Referenced material standards (e.g., ISO 4954) for cold‑heading steels

This standard is essential for stakeholders seeking reliable, standardized requirements and test methods for heat‑treated tapping screws in sheet‑metal applications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST EN ISO 2702:2011
Vezni elementi - Toplotno obdelani pločevinski vijaki - Mehanske in fizikalne
lastnosti (ISO 2702:2022)
Fasteners - Heat treated tapping screws - Mechanical and physical properties (ISO
2702:2022)
Mechanische Verbindungselemente - Wärmebehandelte Blechschrauben - Mechanische
und physikalische Eigenschaften (ISO 2702:2022)
Fixations - Vis à tôle traitées thermiquement - Caractéristiques mécaniques et physiques
(ISO 2702:2022)
Ta slovenski standard je istoveten z: EN ISO 2702:2022
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2702
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 21.060.10 Supersedes EN ISO 2702:2011
English Version
Fasteners - Heat treated tapping screws - Mechanical and
physical properties (ISO 2702:2022)
Fixations - Vis à tôle traitées thermiquement - Mechanische Verbindungselemente -
Caractéristiques mécaniques et physiques (ISO Wärmebehandelte Blechschrauben - Mechanische und
2702:2022) physikalische Eigenschaften (ISO 2702:2022)
This European Standard was approved by CEN on 5 December 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2702:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2702:2022) has been prepared by Technical Committee ISO/TC 2 "Fasteners" in
collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 2702:2011.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 2702:2022 has been approved by CEN as EN ISO 2702:2022 without any modification.

INTERNATIONAL ISO
STANDARD 2702
Fourth edition
2022-12
Fasteners — Heat treated tapping
screws — Mechanical and physical
properties
Fixations — Vis à tôle traitées thermiquement — Caractéristiques
mécaniques et physiques
Reference number
ISO 2702:2022(E)
ISO 2702:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 2702:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 1
5 Mechanical and physical properties . 2
5.1 General . 2
5.2 Surface hardness . 2
5.3 Case-hardened depth . 2
5.4 Core hardness . 3
5.5 Microstructure . 3
5.6 Thread-forming ability . . 3
5.7 Torsional strength . 3
5.8 Ductility . 3
6 Test methods . 4
6.1 General . 4
6.2 Surface hardness test . 4
6.3 Case-hardened depth determination . 4
6.4 Core hardness test . 5
6.5 Microstructure test . 6
6.6 Drive test . 6
6.7 Torsional test. 7
6.8 Ductility test . 8
7 Inspection . 9
7.1 Manufacturer's inspection . 9
7.2 Supplier's inspection . 9
7.3 Purchaser's inspection . 10
7.4 Delivery of test results . 10
8 Marking and labelling .10
8.1 General . 10
8.2 Marking on screws . 10
8.3 Marking on packages (labelling) . 10
Bibliography .11
iii
ISO 2702:2022(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 13,
Fasteners with non-metric thread, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 185, Threaded and nonthreaded mechanical fasteners and
accessories, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This fourth edition cancels and replaces the third edition (ISO 2702:2011), which has been technically
revised.
The main changes are as follows:
— document newly structured with regard to requirements and test methods;
— new Table 1 for mechanical and physical properties and related test methods (see 5.1);
— maximum case-hardened depth increased to 0,12 mm for ST2,2 and ST2,6 (see 5.3);
— maximum core hardness changed from 370 HV back to 390 HV and core hardness test specified
more precisely (see 5.4 and 6.4);
— new clauses for ductility and ductility test added (see 5.8 and 6.8);
— test method for case-hardene
...