FprEN ISO 3506-4

Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 4: Tapping screws with specified grades and hardness classes (ISO/FDIS 3506-4:2024)

ISO 3506-4:2009 specifies the mechanical properties of tapping screws made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures.
It applies to tapping screws with threads from ST2,2 up to and including ST8, in accordance with ISO 1478.
It does not apply to screws with special properties such as weldability.

Mechanische Verbindungselemente - Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 4: Blechschrauben mit festgelegten Stahlsorten und Härteklassen (ISO/FDIS 3506-4:2024)

Dieses Dokument legt die mechanischen und physikalischen Eigenschaften von Blechschrauben aus nichtrostenden, korrosionsbeständigen austenitischen, martensitischen, ferritischen Stählen und Duplex-Stählen mit festgelegten Stahlsorten und Härteklassen fest.
WARNUNG — Blechschrauben, die den Anforderungen dieses Dokuments entsprechen, werden in einem Ugebungstemperaturbereich von 10 °C bis 35 °C geprüft und in einem Anwendungsbereich von −20 °C bis +150 °C eingesetzt. Eventuell ändern sich die festgelegten mechanischen und physikalischen Eigenschaften bei niedrigeren und/oder höheren Temperaturen. Es liegt daher in der Verantwortung des Anwenders, auf der Grundlage der Betriebsumgebungsbedingungen der Baugruppe die geeignete Auswahl zu treffen (siehe auch Abschnitt 5 und Abschnitt 6).
Dieses Dokument gilt für Blechschrauben mit Gewinden ST2,2 bis ST8, nach ISO 1478.
Dieses Dokument gilt nicht für Blechschrauben mit besonderen Eigenschaften, wie z. B. die Schweißbarkeit.

Fixations - Caractéristiques mécaniques des fixations en acier inoxydable résistant à la corrosion - Partie 4: Vis à tôle de grades et classes de dureté spécifiées (ISO/FDIS 3506-4:2024)

L'ISO 3506-4:2009 spécifie les caractéristiques mécaniques des vis à tôle constituées d'aciers inoxydables austénitiques, martensitiques et ferritiques résistant à la corrosion lorsqu'elles sont soumises à essai à une température ambiante comprise entre 10 °C et 35 °C. Ces caractéristiques varient selon la valeur plus ou moins élevée de la température.
L'ISO 3506-4:2009 s'applique aux vis à tôle ayant un filetage compris entre ST2,2 et ST8 inclus, conformément à l'ISO 1478.
L'ISO 3506-4:2009 ne s'applique pas aux vis possédant des caractéristiques spéciales telles que la soudabilité.

Vezni elementi - Mehanske lastnosti veznih elementov iz korozijsko odpornega nerjavnega jekla - 4. del: Navojni vijaki z določenimi kakovostmi in razredi trdote (ISO/FDIS 3506-4:2024)

General Information

• Status: Not Published
• Publication Date: 19-Mar-2025
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
• Current Stage: 5020 - Submission to Vote - Formal Approval
• Start Date: 24-Oct-2024
• Completion Date: 24-Oct-2024
• Ref Project: kSIST FprEN ISO 3506-4:2024 - Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 4: Tapping screws with specified grades and hardness classes (ISO/FDIS 3506-4:2024)

Relations

• Revises: EN ISO 3506-4:2009 - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 4: Tapping screws (ISO 3506-4:2009)
• Effective Date: 21-Jun-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 3506-4:2024
01-februar-2024
Vezni elementi - Mehanske lastnosti veznih elementov iz korozijsko odpornega
nerjavnega jekla - 4. del: Navojni vijaki z določenimi kakovostmi in razredi trdote
(ISO/DIS 3506-4:2023)
Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners - Part
4: Tapping screws with specified grades and hardness classes (ISO/DIS 3506-4:2023)
Mechanische Verbindungselemente - Mechanische Eigenschaften von
Verbindungselementen aus nichtrostenden Stählen - Teil 4: Blechschrauben mit
festgelegten Stahlsorten und Härteklassen (ISO/DIS 3506-4:2023)
Fixations - Caractéristiques mécaniques des fixations en acier inoxydable résistant à la
corrosion - Partie 4: Vis à tôle de grades et classes de dureté spécifiées (ISO/DIS 3506-
4:2023)
Ta slovenski standard je istoveten z: prEN ISO 3506-4
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
77.140.20 Visokokakovostna jekla Stainless steels
oSIST prEN ISO 3506-4:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 3506-4:2024
oSIST prEN ISO 3506-4:2024
DRAFT INTERNATIONAL STANDARD
ISO/DIS 3506-4
ISO/TC 2 Secretariat: DIN
Voting begins on: Voting terminates on:
2023-11-28 2024-02-20
Fasteners — Mechanical properties of corrosion-resistant
stainless steel fasteners —
Part 4:
Tapping screws with specified grades and hardness classes
ICS: 21.060.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 3506-4:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 3506-4:2024
ISO/DIS 3506-4:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 3506-4
ISO/TC 2 Secretariat: DIN
Voting begins on: Voting terminates on:

Fasteners — Mechanical properties of corrosion-resistant
stainless steel fasteners —
Part 4:
Tapping screws with specified grades and hardness classes
ICS: 21.060.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 3506-4:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 3506-4:2024
ISO/DIS 3506-4:2023(E)
Contents Page
Introduction .iv
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation system for stainless steel grades and hardness classes .2
4.1 General . 2
4.2 Designation of stainless steel grades (first block) . 3
4.3 Designation of hardness classes (second block) . 4
5 Materials . 4
5.1 Chemical composition . 4
5.2 Heat treatment for martensitic stainless steel tapping screws . 5
5.3 Surface condition (finish and/or coating) . 5
5.4 Corrosion resistance . 6
5.5 Magnetic properties . 6
6 Requirements for mechanical and physical properties . 6
6.1 General . 6
6.2 Surface hardness for martensitic grades . 7
6.3 Core hardness . 7
6.4 Torsional strength . 7
6.5 Thread forming capability . 7
7 Inspection . 7
7.1 Manufacturer’s inspection . 7
7.2 Supplier’s inspection . 8
7.3 Purchaser’s inspection . 8
7.4 Delivery of test results . 8
8 Test methods . 8
8.1 Applicability . 8
8.2 Hardness tests . 8
8.2.1 General . 8
8.2.2 Surface hardness test . 8
8.2.3 Core hardness test . 9
8.2.4 Test results and requirements . 9
8.3 Torsional test. 9
8.4 Drive test . 11
9 Marking and labelling .12
9.1 General .12
9.2 Marking on the tapping screws .12
9.3 Marking of the packages (labelling) .12
Bibliography .13
iii
oSIST prEN ISO 3506-4:2024
ISO/DIS 3506-4:2023(E)
Introduction
The properties of stainless steel fasteners result from the chemical composition of the material
(especially corrosion resistance) and from the mechanical properties due to the manufacturing
processes. Ferritic, austenitic, and duplex (austenitic-ferritic) stainless steel fasteners are generally
manufactured by cold working; they consequently do not have homogeneous local material properties
when compared to quenched and tempered fasteners.
Austenitic-ferritic stainless steels referred to as duplex stainless steel grades were originally invented
in the 1930s and have been increasingly used since the 1980s. This document was revised to reflect
their standardization for fasteners.
All duplex stainless steel grades show improved resistance to stress corrosion cracking compared to
the commonly used A2 to A5 austenitic grades. Most duplex grades also show higher levels of pitting
corrosion resistance, where D2 matches at least A2 and where D4 matches at least A4.
Complementary detailed explanations about stainless steel grades and properties are specified in
ISO 3506-6.
iv
oSIST prEN ISO 3506-4:2024
ISO/DIS 3506-4:2023(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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, IS
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