EN ISO 3506-2:1997
(Main)Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 2: Nuts (ISO 3506-2:1997)
Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 2: Nuts (ISO 3506-2:1997)
Covers the requirements for the design rule of terminal shape plastic packages with gull-wing leads (e.g. QFP, SOP, SSOP, TSOP, etc.)
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen - Teil 2: Muttern (ISO 3506-2:1997)
Dieser Teil der Norm ISO 3506 legt die mechanischen Eigenschaften von Muttern aus nichtrostenden, austenitischen, martensitischen und ferritischen Stählen bei Prüfung in einem Umgebungstemperaturbereich zwischen 15 °C und 25 °C fest. Die Eigenschaften verändern sich bei höheren oder tieferen Temperaturen. Sie gilt für Muttern - mit Gewinde-Nenndurchmessern (d) bis einschließlich 39 mm; - mit metrischen ISO-Gewinden mit Durchmessern und Steigungen nach ISO 68-1, ISO 261 und ISO 262; - mit beliebiger Form; - mit Schlüsselweiten nach ISO 272; - mit Nennhöhen gleich oder größer 0,5 d.
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant à la corrosion - Partie 2: Ecrous (ISO 3506-2:1997)
Mehanske lastnosti veznih elementov iz nerjavnega jekla - 2. del: Matice (ISO 3506-2:1997)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 3506-2:2001
01-julij-2001
Mehanske lastnosti veznih elementov iz nerjavnega jekla - 2. del: Matice (ISO 3506-
2:1997)
Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 2: Nuts (ISO
3506-2:1997)
Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Stählen -
Teil 2: Muttern (ISO 3506-2:1997)
Caractéristiques mécaniques des éléments de fixation en acier inoxydable résistant a la
corrosion - Partie 2: Ecrous (ISO 3506-2:1997)
Ta slovenski standard je istoveten z: EN ISO 3506-2:1997
ICS:
21.060.20 Matice Nuts
SIST EN ISO 3506-2:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 3506-2:2001
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SIST EN ISO 3506-2:2001
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SIST EN ISO 3506-2:2001
INTERNATIONAL ISO
STANDARD 3506-2
First edition
1997-12-01
Mechanical properties of corrosion-
resistant stainless-steel fasteners -
Part 2:
Nuts
Caract&istiques mkcaniques des Mments de fixation en acier inoxydable
r&istant ti la corrosion -
Parfie 2: Ecrous
Reference number
ISO 3506-2: 1997(E)
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SIST EN ISO 3506-2:2001
ISO 3506-2:1997( 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. Esch 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 ilS0, also take patt in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard ISO 3506-2 was prepared by Technical Committee
ISO/TC 2, Fasteners, Sub-Committee SC 1, Mechanical properfies of
fasteners.
This first edition, together with ISO 3506-1 and ISO 3506-3, cancels and
replaces ISO 3506:1979, 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
- Parf2: Nuts
- Part 3: Set screws and similar fasteners not under tensile stress
Annexes A to G of this patt of ISO 3506 are for information only.
0 ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Internet central @? iso.ch
c=ch; a=400net; p=iso; o=isocs; s=central
x.400
Printed in Switzerland
ii
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SIST EN ISO 3506-2:2001
0 ISO
ISO 3506-2:1997( E)
Introduction
In the preparation of this patt 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 consequentiy the components do not have as homogeneous a condition
as hardened and tempered Parts. These special features have been
recognized in the elaboration of the property classes and the test procedures
for mechanicat properties.
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SIST EN ISO 3506-2:2001
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SIST EN ISO 3506-2:2001
INTERNATIONAL STANDARD @ ISO ISO 3506-2: 1997(E)
Mechanical properties of corrosion-resistant stainless-steel fasteners -
Part 2:
Nuts
1 Scope
This part of ISO 3506 specifies the mechanical properties of nuts made of austenitic, martensitic and ferritic grades
of corrosion-resistant stainless steels when tested over an ambient temperature range of 15 “C to 25 “C. Proper-Ges
will vary at higher or lower temperatures.
lt applies to nuts
- with nominal thread diameters (d) up to and including 39 mm;
- of triangular ISO metric threads with diameters (d) and pitches in accordance with ISO 68-1, ISO 261 and
ISO 262;
- of any shape;
- with width across flats as specified in ISO 272;
- with nominal heights greater than or equal to 0,5 d.
lt does not apply to nuts requiring proper-Ges such as
- locking abilities;
- weldability.
This patt of ISO 3506 does not define corrosion or Oxidation resistance in particular environments.
The aim of this part of ISO 3506 is a classification into property classes of corrosion resistant stainless steel
fasteners. Some materials tan be used at temperatures down to -200 “C, some tan be used at temperatures up to
+800 “C in air. Information on the influence of temperature on mechanical proper-Ges is found in annex D.
Corrosion and Oxidation performances and mechanical properties for use at elevated or sub-zero temperatures must
be the subject of agreement between user and manufacturer in each particular case. Annex E Shows how the risk of
intergranular corrosion at elevated temperatures depends on the carbon content.
All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some
magnetic properties may be evident (see annex F).
2 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 3506. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and
Parties to agreements based on this part of ISO 3506 are encouraged to investigate the possibility of applying the
most recent editions of the Standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
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SIST EN ISO 3506-2:2001
0 ISO
EO 3506-2: 1997(E)
/SO general purpose screw threads - Basic profile - Part 7: Metric screw threads.
BS0 68-1: --liJ
-29, ISO general purpose metric screw threads - General plan.
ISO 261:
ISO 262:~39, ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts.
ISO 272: 1982, Fasteners - Hexagon products - Widths across flats.
ISO 898-2: 1992, Mechanical properties of fasteners - Part 2: Nuts with specified proof Load values - Coarse thread.
ISO 898-6: 1994, Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread.
ISO 3651-1: -49, Determination of resistance to intergranular corrosion stainless steels - Part 7: Austenitic and
Corrosion test in nitric acid medium by measurement of loss in mass
ferritic-austenitic (duplex) stainless steels -
(Huey test).
ISO 3651-2: -59, Determination of resistance to intergranular corrosion stainless steels - Part 2: Ferritic, austenitic
and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing suifuric acid.
ISO 6506: 1981, Metallic materials - Hardness test - Brinell test.
ISO 6507-1:1997, Metallic materials - Hardness fest - Vickers test - Part 7: Test method.
ISO 6508:1986, Metallic materials - Hardness test - Rockwell test (scales A - B - C - D - E - F- G - H - K).
3 Designation, marking and finish
3.1 Designation
The designation System for stainless steel grades and property classes for nuts is shown in figure 1. The designation
of the material consists of two blocks which are separated by a hyphen. The first block designates the steel grade,
the second block the propet-ty class.
The designation of the steel grade (first block) consists of the Ietters
A for austenitic steel or
C for martensitic steel or
F for ferritic steel
which indicate the group of steel and a digit which indicates a range of Chemical compositions within this steel
group.
The designation of the property class (second block) consists of 2 digits for nuts with the height m 2 0,8 d (style 1)
which indicates l/lO of the stress under proof load and 3 digits for nuts with the height 0,5 d s m c 0,8 d (thin nuts),
the first digit indicating that the nut has a reduced loadability and the following two digits l/lO of the stress under
proof load.
NOTE - For the definition of style 1 for nuts see ISO 898-2:1992, annex A.
To be published. (Revision of ISO 68:1973)
19
To be published. (Revision of ISO 261:1973
2)
3) To be published. (Revision of ISO 262:1973)
To be published. (Revision of ISO 3651-1:1976)
4)
To be published. (Revision of ISO 3651-2:1976)
5)
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SIST EN ISO 3506-2:2001
0 ISO ISO 3506-2:1997( E)
Examples for the designation of material:
1) A2-70 indicates:
austenitic steel, cold worked, minimum 700 N/mm2 (700 MPa) stress under proof load (nut of style 1).
2) C4-70 indicates:
martensitic steel, hardened and tempered, minimum 700 N/mm2 (700 MPa) stress under proof load (nut of
style 1).
3) A2-035 indicates:
austenitic steel, cold worked, minimum 350 N/mm2 (350 MPa) stress under proof load (thin nut).
Steel group ‘) , , yyq /
Steel grade” Fl
Property class
l-7
80 45 60
Nuts style 1 SO 80
I l
040 030
Thin nuts 025 025 035 055 025 035 040 020
/ /
v I l
Soft Cold-
Soft Cold- High- Soft Hardened Soft Hardened Hardened
worked worked
strength and and and
tempered tempered tempered
1) The steel groups and steel grades classified in figure 1 are described in annex A and specified by the Chemical
composition given in table 1.
2) Low carbon stainless steels with carbon content not exceeding 0,03 % may additionally be marked with an L.
EXAMPLE: A4L - 80
Figure 1 - Designation System for stainless steel grades and property classes for nuts
3.2 Marking
Only if all requirements in this part of ISO 3506 are met, Parts shall be marked and/or described according to the
designation System described in 3.1.
3.2.1 Nuts
Marking is mandatory on nuts with nominal thread diameters d. > 5 mm and shall be marked with the steel grade
and property class in accordance with 3.1, figure 1 and figure 2 and with the manufacturer ’s identification mark,
provided this is possible for technical reasons. Marking of only one nut face is acceptable and shall be only by
indentation when applied to the bearing surface of the nuts. Alternatively, marking on the side of the nuts is
permissible.
VVhen the marking is made with grooves (see figure 2) and the property class is not indicated, property ciass 50 or
025 will apply.
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SIST EN ISO 3506-2:2001
ISO 3506-2: 1997(E)
XYZ
i -
4
Cl-025
2) 3)
l
Thin nuts
Nuts style 1
1) manufacturer ’s identification mark
2) steel grade
3) property class
Marking with material designation and manufacturer ’s identification mark
AZ A4
s is the width across flats
Alternative groove marking (for A2 and A4 steel grades only)
NOTE - For marking of left-hand thread, see ISO 898-2.
Figure 2 - Marking of nuts
3.2.2 Fuckages
Marking with the designation and manufacturer ’s identification mark is mandatory on all packages of all sizes.
3.3 Finish
Unless otherwise specified, fasteners in accordance with this part of ISO 3506 shall be supplied clean and bright. For
maximum corrosion resistance passivation is recommended.
4 Chemical composition
The Chemical compositions of stainless steels suitable for fasteners in accordance with this part of ISO 3506 are
given in table 1.
The final choice of Chemical composition within the specified steel grade is at the discretion of the manufacturer
unless by Prior agreement between the purchaser and the manufacturer.
4
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SIST EN ISO 3506-2:2001
0 ISO ISO 3506-2: 1997(E)
In applications where risk of intergranular corrosion is present, testing in accordance with ISO 3651-1 or ISO 3651-2
is recommended. In such cases, stabilized stainless steels A3 and A5 or stainless steels A2 and A4 with carbon
content not exceeding 0,03 % are recommended.
Table 1 - Stainless steel grades - Chemical composition
I
Chemicail composition
Group Grade % (rn/rn)l) Notes
C Si Mn P S Cr Mo Ni Cu
0,12 1 6,5 082 0,15 to 0,35 16 to 19 0,7 5to 10 1,75 to 2,25 2) 3) 4)
Austenitic Al
A2 0,l
1 2 0,05 0,03 15to20 -5) 8to19 4 7) 8)
A3 0,08 1 2 0,045
0,03 17 to 19 -5) 9to12 1 9)
A4 0,08
1 2 0,045 0,03 16to18,5 2to3 lOto15 1
8) IO)
A5 0,08 1 2 0,045
0,03 16to 18,5 2 to 3 IO,5 to 14 1 9) IO)
Martensitic Cl 0,09 to 0,15 1 1 0,05 0,03
11,5to14 - 1 10)
c3 0,17 to 0,25 1 1 0,04 0,03 16to18 - 1,5 to 2,5 -
c4 0,08 to 0,15 1 1,5 0,06 0,15to 0,35 12 to 14 0,6 1
2) 10)
Ferritic Fl 0,12 1 1 0,04 0,03
15to18 -6) 1 11)12)
NOTES
1 A description of the groups and grades of stainless steels also entering into their specific properties and application is given in
annex A.
2 Examples for stainless steels which are standardized in ISO 683-13 and in ISO 4954 are given in annexes B and C respectively.
1) Values are maximum unless otherwise indicated.
2) Sulfur may be replaced by selenium.
3) If the nicke1 content is below 8 %, the minimum manganese content must be 5 %.
4) There is no minimum limit to the topper content provided that the nicke1 content is greater than 8 %.
5) Molybdenum may be present at the discretion of the manufacturer. However, if for some applications limiting of the molybdenum
content is essential, this must be stated at the time of ordering by the purchaser.
6) Molybdenum may be present at the discretion of the manufacturer.
7) If the chromium content is below 17 %, the minimum nicke1 content should be 12 %.
8) For austenitic stainless steels having a maximum carbon content of 0,03 %, nitrogen may be present to a maximum of 0,22 %.
9) Must contain titanium 2 5 x C up to 0,8 % maximum for stabilization and be marked appropriately in accordance with this table, or
must contain niobium (columbium) and/or tantalum 2 10 x C up to 1,O % maximum for stabilization and be marked appropriately in
accordance with this table.
10) At the discretion of the manufacturer the carbon content may be higher where required to obtain the specified mechanical
proper-Ges at larger diameters, but shall not exceed 0,12 % for austenitic steels.
11) May contain titanium 2 5 x C up to 0,8 % maximum.
12) May contain niobium (columbium) and/or tantalum 2 10 x C up to 1 % maximum.
5 Mechanical properties
The mechanical properties of nuts in accordance with this part of ISO 3506 shall conform to the values given in
table 2 or 3.
For acceptance purposes the mechanical properties as given in this clause apply and shall be tested as follows:
- hardness test, according to 6.1 (only grades Cl, C3 and C4, hardened and tempered);
- proof load test, according to 6.2.
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SIST EN ISO 3506-2:2001
ISO 3506-2: 1997(E) @ISO
rable 2 - Mechanical properties for nuts - Austenitic grades
1
Stress under proof load
Range of
sP
Group
Grade Property class thread
min.
diameter
N/mm*
Nuts style 1 Thin nuts d Nuts style 1 Thin nuts
(m 2 0,8 d) (0,5 d c m < 0,8 d) mm (m 2 0,8 d) (0,5 d s m < 0,8 d)
Al
50 025 s 39 500 250
Austenitic A2, A3 035 1) 700 350
70 =s 24
A4, A5
040 6 24 1) 800 400
80
1) For fasteners 31 thread diameters d > 24 mm the
...
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