EN ISO 3506-3:2009

Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress (ISO 3506-3:2009)

ISO 3506-3:2009 specifies the mechanical properties of set screws and similar fasteners not under tensile stress made of austenitic stainless steel, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures.
ISO 3506-3:2009 applies to set screws and similar fasteners:
- with nominal thread diameter 1,6 mm ≤ d ≤ 24 mm;
- of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262;
- of any shape.
It does not apply to screws with special properties, such as weldability.

Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 3: Gewindestifte und ähnliche nicht auf Zug beanspruchte Verbindungselemente (ISO 3506-3:2009)

Dieser Teil von ISO 3506 legt die mechanischen Eigenschaften von Gewindestiften und ähnlichen nicht auf Zug beanspruchten Verbindungselementen aus austenitischen nichtrostenden Stählen bei Prüfung in einem Umgebungstemperaturbereich von 10 °C bis 35 °C fest. Die Eigenschaften verändern sich bei höheren oder tieferen Temperaturen.
Dieser Teil von ISO 3506 gilt für Gewindestifte und ähnliche Verbindungselemente
-   mit Gewindenenndurchmessern 1,6 mm  d  24 mm;
-   mit metrischen ISO Gewinden mit Durchmessern und Steigungen nach ISO 68 1, ISO 261 und ISO 262;
-   mit beliebiger Form.
Dieses Dokument gilt nicht für Gewindestifte mit besonderen Eigenschaften, wie z. B die Schweißbarkeit.
ANMERKUNG   Das Bezeichnungssystem in diesem Teil von ISO 3506 kann auch für Nenngrößen außerhalb der in diesem Abschnitt angegebenen Grenzen (z. B. d > 24 mm) verwendet werden, vorausgesetzt alle der jeweiligen Härte¬klasse zugeordneten mechanischen und physikalischen Anforderungen werden erfüllt.
Dieser Teil von ISO 3506 enthält keine Festlegungen über die Korrosion oder Korrosionsbeständigkeit in besonderen Umgebungen.
Zweck dieses Teils von ISO 3506 ist die Einteilung von Verbindungselementen aus nichtrostenden Stählen in Härteklassen.
Anforderungen an die Korrosionsbeständigkeit und die mechanischen Eigenschaften für den Einsatz bei höheren Temperaturen oder bei Temperaturen unter 0 °C können in jedem Einzelfall zwischen Anwender und Hersteller vereinbart werden. Im Anhang D ist dargestellt, wie die Gefahr einer interkristallinen Korrosion bei erhöhten Temperaturen vom Kohlenstoffgehalt abhängt.
Alle Verbindungselemente aus austenitischen nichtrostenden Stählen sind im geglühten Zustand in der Regel nicht magnetisch; es können jedoch nach dem Kaltumformen gewisse magnetische Eigenschaften vorliegen (siehe Anhang E).

Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion - Partie 3: Vis sans tête et éléments de fixation similaires non soumis à des contraintes de traction (ISO 3506-3:2009)

L'ISO 3506-3:2009 spécifie les caractéristiques mécaniques des vis sans tête et des éléments de fixation filetés similaires non soumis à des contraintes de traction, constitués d'aciers inoxydables austénitiques, soumis 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 3506-3:2009 s'applique aux vis sans tête et aux éléments de fixation filetés similaires
de diamètre nominal de filetage 1,6 mm ≤ d ≤ 24 mm,
à filetage métrique ISO triangulaire dont le diamètre et le pas sont conformes à l'ISO 68-1, l'ISO 261 et à l'ISO 262, et
de forme quelconque.
Elle ne s'applique pas aux vis possédant des caractéristiques spéciales telles que la soudabilité.

Mehanske lastnosti veznih elementov iz nerjavnega jekla - 3. del: Navojni zatiči in podobni vijaki, ki niso natezno obremenjeni (ISO 3506-3:2009)

Ta del ISO 3506 določa mehanske lastnosti navojnih zatičev in podobnih vijakov, ki niso natezno obremenjeni, narejenih iz avstenitnega nerjavnega jekla, pri preskušanju v območju okoljske temperature med 10 °C in 35 °C.
Lastnosti se spreminjajo glede na višje ali nižje temperature.
Ta del ISO 3506 velja za navojne zatiče in podobne vijake:
⎯ z nazivnim premerom navoja 1,6 mm u d u 24 mm;
⎯ s trikotnimi metrskimi navoji ISO s premeri in nakloni v skladu z ISO 68-1, ISO 261 in ISO 262;
⎯ katere koli oblike.
Ne velja za vijake s posebnimi lastnostmi, kot je varivost.
OPOMBA: Sistem označevanja v tem delu ISO 3506 se lahko uporablja za velikosti zunaj omejitev, podanih v tej točki (npr. d  24 mm), če so izpolnjene veljavne mehanske in fizikalne zahteve razredov trdote.
Ta del ISO 3506 ne opredeljuje odpornosti proti koroziji ali oksidaciji v nekaterih okoljih.
Namen tega dela ISO 3506 je razvrstitev vijakov iz nerjavnega jekla, odpornega proti koroziji, v razrede trdote.
O zmogljivostih, povezanih s korozijo in oksidacijo, ter mehanskih lastnostih za uporabo pri povišanih temperaturah ali temperaturah pod nič se lahko dogovorita uporabnik in proizvajalec za vsak posamezen primer. Dodatek D prikazuje, kako je tveganje za interkristalno korozijo pri povišanih temperaturah odvisno od vsebnosti ogljika. Vsi vezni elementi iz avstenitnega nerjavnega jekla so v nežarjenem stanju običajno nemagnetni; po hladni obdelavi so nekatere magnetne lastnosti očitne (glej dodatek E).

General Information

• Status: Published
• Publication Date: 14-Nov-2009
• Withdrawal Date: 30-May-2010
• 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: 15-Nov-2009
• Due Date: 12-Sep-2010
• Completion Date: 15-Nov-2009
• Ref Project: SIST EN ISO 3506-3:2011 - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress (ISO 3506-3:2009)

Relations

• Replaces: EN ISO 3506-3:1997 - Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress (ISO 3506-3:1997)
• Effective Date: 22-Dec-2008
• Revised: FprEN ISO 3506-3 - Fasteners - Mechanical properties of corrosion resistant stainless steel fasteners - Part 3: Set screws (and similar fasteners not under tensile stress) with specified grades and hardness classes (ISO/FDIS 3506-3:2024)
• Effective Date: 21-Jun-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2011
Nadomešča:
SIST EN ISO 3506-3:2001
SIST ISO 3506-3:2000
Mehanske lastnosti veznih elementov iz nerjavnega jekla - 3. del: Navojni zatiči in
podobni vijaki, ki niso natezno obremenjeni (ISO 3506-3:2009)
Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws
and similar fasteners not under tensile stress (ISO 3506-3:2009)
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen -
Teil 3: Gewindestifte und ähnliche nicht auf Zug beanspruchte Verbindungselemente
(ISO 3506-3:2009)
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la
corrosion - Partie 3: Vis sans tête et éléments de fixation similaires non soumis à des
contraintes de traction (ISO 3506-3:2009)
Ta slovenski standard je istoveten z: EN ISO 3506-3:2009
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
77.140.20 Visokokakovostna jekla Stainless steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 3506-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2009
ICS 21.060.10 Supersedes EN ISO 3506-3:1997
English Version
Mechanical properties of corrosion-resistant stainless steel
fasteners - Part 3: Set screws and similar fasteners not under
tensile stress (ISO 3506-3:2009)
Caractéristiques mécaniques des éléments de fixation en Mechanische Eigenschaften von Verbindungselementen
acier inoxydable résistant à la corrosion - Partie 3: Vis sans aus nichtrostenden Stählen - Teil 3: Gewindestifte und
tête et éléments de fixation similaires non soumis à des ähnliche nicht auf Zug beanspruchte Verbindungselemente
contraintes de traction (ISO 3506-3:2009) (ISO 3506-3:2009)
This European Standard was approved by CEN on 24 October 2009.

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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3506-3:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 3506-3:2009) 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 DIN.
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 May 2010, and conflicting national standards shall be withdrawn at the
latest by May 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3506-3:1997.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 3506-3:2009 has been approved by CEN as a EN ISO 3506-3:2009 without any modification.

INTERNATIONAL ISO
STANDARD 3506-3
Second edition
2009-11-15
Mechanical properties of corrosion-
resistant stainless steel fasteners —
Part 3:
Set screws and similar fasteners not
under tensile stress
Caractéristiques mécaniques des éléments de fixation en acier
inoxydable résistant à la corrosion —
Partie 3: Vis sans tête et éléments de fixation similaires non soumis à
des contraintes de traction
Reference number
ISO 3506-3:2009(E)
©
ISO 2009
ISO 3506-3:2009(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2009 – All rights reserved

ISO 3506-3:2009(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Designation, marking and finish.2
3.1 Designation .2
3.2 Marking.3
3.3 Finish .4
4 Chemical composition .4
5 Mechanical properties.5
5.1 General .5
5.2 Proof torque of hexagon socket set screws.5
5.3 Hardness .6
6 Test methods .6
6.1 Proof torque test for hexagon socket set screws.6
6.2 Hardness test HB, HRB or HV for set screws.7
Annex A (normative) Description of the groups and grades of stainless steels .8
Annex B (informative) Austenitic stainless steel composition specifications .11
Annex C (informative) Austenitic stainless steels for cold heading and extruding.13
Annex D (informative) Time-temperature diagram of intergranular corrosion in austenitic
stainless steels, grade A2 (18/8 steels).15
Annex E (informative) Magnetic properties for austenitic stainless steels .16
Bibliography.17

ISO 3506-3:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 3506-3 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical
properties of fasteners.
This second edition cancels and replaces the first edition (ISO 3506-3:1997), which has been technically
revised.
ISO 3506 consists of the following parts, under the general title Mechanical properties of corrosion-resistant
stainless steel fasteners:
⎯ Part 1: Bolts, screws and studs
⎯ Part 2: Nuts
⎯ Part 3: Set screws and similar fasteners not under tensile stress
⎯ Part 4: Tapping screws
iv © ISO 2009 – All rights reserved

ISO 3506-3:2009(E)
Introduction
In the preparation of this part of ISO 3506, special attention has been given to the fundamentally different
property characteristics of the stainless steel fastener grades compared with those of carbon steel and
low-alloy steel fasteners. Austenitic stainless steels are strengthened only by cold working and consequently
the components do not have as homogeneous local material properties as hardened and tempered parts.
These special features have been recognized in the elaboration of the hardness classes and the test
procedures for mechanical properties.

INTERNATIONAL STANDARD ISO 3506-3:2009(E)

Mechanical properties of corrosion-resistant stainless steel
fasteners —
Part 3:
Set screws and similar fasteners not under tensile stress
1 Scope
This part of ISO 3506 specifies the mechanical properties of set screws and similar fasteners not under tensile
stress made of austenitic stainless steel, when tested over an ambient temperature range of 10 °C to 35 °C.
Properties vary at higher or lower temperatures.
This part of ISO 3506 applies to set screws and similar fasteners:
⎯ with nominal thread diameter 1,6 mm u d u 24 mm;
⎯ of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and
ISO 262;
⎯ of any shape.
It does not apply to screws with special properties, such as weldability.
NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause
(e.g. d > 24 mm), provided that all applicable mechanical and physical requirements of the hardness classes are met.
This part of ISO 3506 does not define corrosion or oxidation resistance in particular environments.
The aim of this part of ISO 3506 is the classification of corrosion-resistant stainless steel fasteners into
hardness classes.
Corrosion and oxidation performances and mechanical properties for us
...

SLOVENSKI STANDARD
01-junij-2011
1DGRPHãþD
SIST EN ISO 3506-3:2001
SIST ISO 3506-3:2000
0HKDQVNHODVWQRVWLYH]QLKHOHPHQWRYL]QHUMDYQHJDMHNODGHO1DYRMQL]DWLþLLQ
SRGREQLYLMDNLNLQLVRQDWH]QRREUHPHQMHQL,62
Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws
and similar fasteners not under tensile stress (ISO 3506-3:2009)
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen -
Teil 3: Gewindestifte und ähnliche nicht auf Zug beanspruchte Verbindungselemente
(ISO 3506-3:2009)
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la
corrosion - Partie 3: Vis sans tête et éléments de fixation similaires non soumis à des
contraintes de traction (ISO 3506-3:2009)
Ta slovenski standard je istoveten z: EN ISO 3506-3:2009
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.

EUROPEAN STANDARD
EN ISO 3506-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2009
ICS 21.060.10 Supersedes EN ISO 3506-3:1997
English Version
Mechanical properties of corrosion-resistant stainless steel
fasteners - Part 3: Set screws and similar fasteners not under
tensile stress (ISO 3506-3:2009)
Caractéristiques mécaniques des éléments de fixation en Mechanische Eigenschaften von Verbindungselementen
acier inoxydable résistant à la corrosion - Partie 3: Vis sans aus nichtrostenden Stählen - Teil 3: Gewindestifte und
tête et éléments de fixation similaires non soumis à des ähnliche nicht auf Zug beanspruchte Verbindungselemente
contraintes de traction (ISO 3506-3:2009) (ISO 3506-3:2009)
This European Standard was approved by CEN on 24 October 2009.

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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3506-3:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 3506-3:2009) 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 DIN.
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 May 2010, and conflicting national standards shall be withdrawn at the
latest by May 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3506-3:1997.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 3506-3:2009 has been approved by CEN as a EN ISO 3506-3:2009 without any modification.

INTERNATIONAL ISO
STANDARD 3506-3
Second edition
2009-11-15
Mechanical properties of corrosion-
resistant stainless steel fasteners —
Part 3:
Set screws and similar fasteners not
under tensile stress
Caractéristiques mécaniques des éléments de fixation en acier
inoxydable résistant à la corrosion —
Partie 3: Vis sans tête et éléments de fixation similaires non soumis à
des contraintes de traction
Reference number
ISO 3506-3:2009(E)
©
ISO 2009
ISO 3506-3:2009(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2009 – All rights reserved

ISO 3506-3:2009(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Designation, marking and finish.2
3.1 Designation .2
3.2 Marking.3
3.3 Finish .4
4 Chemical composition .4
5 Mechanical properties.5
5.1 General .5
5.2 Proof torque of hexagon socket set screws.5
5.3 Hardness .6
6 Test methods .6
6.1 Proof torque test for hexagon socket set screws.6
6.2 Hardness test HB, HRB or HV for set screws.7
Annex A (normative) Description of the groups and grades of stainless steels .8
Annex B (informative) Austenitic stainless steel composition specifications .11
Annex C (informative) Austenitic stainless steels for cold heading and extruding.13
Annex D (informative) Time-temperature diagram of intergranular corrosion in austenitic
stainless steels, grade A2 (18/8 steels).15
Annex E (informative) Magnetic properties for austenitic stainless steels .16
Bibliography.17

ISO 3506-3:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 3506-3 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical
properties of fasteners.
This second edition cancels and replaces the first edition (ISO 3506-3:1997), which has been technically
revised.
ISO 3506 consists of the following parts, under the general title Mechanical properties of corrosion-resistant
stainless steel fasteners:
⎯ Part 1: Bolts, screws and studs
⎯ Part 2: Nuts
⎯ Part 3: Set screws and similar fasteners not under tensile stress
⎯ Part 4: Tapping screws
iv © ISO 2009 – All rights reserved

ISO 3506-3:2009(E)
Introduction
In the preparation of this part of ISO 3506, special attention has been given to the fundamentally different
property characteristics of the stainless steel fastener grades compared with those of carbon steel and
low-alloy steel fasteners. Austenitic stainless steels are strengthened only by cold working and consequently
the components do not have as homogeneous local material properties as hardened and tempered parts.
These special features have been recognized in the elaboration of the hardness classes and the test
procedures for mechanical properties.

INTERNATIONAL STANDARD ISO 3506-3:2009(E)

Mechanical properties of corrosion-resistant stainless steel
fasteners —
Part 3:
Set screws and similar fasteners not under tensile stress
1 Scope
This part of ISO 3506 specifies the mechanical properties of set screws and similar fasteners not under tensile
stress made of austenitic stainless steel, when tested over an ambient temperature range of 10 °C to 35 °C.
Properties vary at higher or lower temperatures.
This part of ISO 3506 applies to set screws and similar fasteners:
⎯ with nominal thread diameter 1,6 mm u d u 24 mm;
⎯ of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and
ISO 262;
⎯ of any shape.
It does not apply to screws with special properties, such as weldability.
NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause
(e.g. d > 24 mm), provided that all applicable mechanical and physical requirements of the hardness classes are met.
This part of ISO 3506 does not define corrosion or oxidation resistance in particular environments.
The aim of this part of ISO 3506 is the classification of corrosion-resistant stainless steel fasteners into
hardness classes.
Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero
t
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