SIST EN ISO 898-1:2001

SLOVENSKI STANDARD
01-julij-2001
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SIST EN 20898-1:1996
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Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts,
screws and studs (ISO 898-1:1999)
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und
legiertem Stahl - Teil 1: Schrauben (ISO 898-1:1999)
Caractéristiques mécaniques des éléments de fixation en acier au carbone et en acier
allié - Partie 1:Vis et goujons (ISO 898-1:1999)
Ta slovenski standard je istoveten z: EN ISO 898-1:1999
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.

INTERNATIONAL ISO
STANDARD 898-1
Third edition
1999-08-01
Mechanical properties of fasteners made of
carbon steel and alloy steel —
Part 1:
Bolts, screws and studs
Caractéristiques mécaniques des éléments de fixation en acier au carbone
et en acier allié —
Partie 1: Vis et goujons
A
Reference number
ISO 898-1:1999(E)
ISO 898-1:1999(E)
Contents Page
1 Scope .1
2 Normative references .2
3 Designation system.2
4 Materials .3
5 Mechanical and physical properties .3
6 Mechanical and physical properties to be determined.7
7 Minimum ultimate tensile loads and proof loads .9
8 Test methods.12
8.1 Tensile test for machined test pieces.12
8.2 Tensile test for full-size bolts, screws and studs.13
8.3 Torsional test .14
8.4 Hardness test .14
8.5 Proof load test for full-size bolts and screws .14
8.6 Test for tensile strength under wedge loading of full-size bolts and screws (not studs).16
8.7 Impact test for machined test pieces.17
8.8 Head soundness test for full-size bolts and screws with d < 10 mm and with lengths too short to permit
wedge load testing .17
8.9 Decarburization test: evaluation of surface carbon condition.18
8.10 Retempering test.21
8.11 Surface discontinuity inspection .21
9 Marking .21
9.1 Manufacturer's identification marking.21
9.2 Marking symbols for property class .21
©  ISO 1999
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO 898-1:1999(E)
9.3 Identification . 22
9.4 Marking of bolts and screws with left-hand thread. 24
9.5 Alternative marking . 25
9.6 Marking of packages . 25
Annex A (informative) Lower yield stress or stress at 0,2 % non-proportional elongation at elevated
temperature.26
iii
© ISO
ISO 898-1:1999(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.
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 898-1 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1,
Mechanical properties of fasteners.
This third edition cancels and replaces the second edition (ISO 898-1:1988) which has been technically revised.
ISO 898 consists of the following parts, under the general title Mechanical properties of fasteners made of carbon
steel and alloy steel:
 Part 1: Bolts, screws and nuts
 Part 2: Nuts with specified proof load values — Coarse thread

Part 5: Set screws and similar threaded fasteners not under tensile stresses
 Part 6: Nuts with specified proof load values — Fine pitch thread
 Part 7: Torsional test and minimum torques for bolts and screws with nominal diameter from 1 mm to 10 mm
Annex A of this part of ISO 898 is for information only.
iv
INTERNATIONAL STANDARD  © ISO ISO 898-1:1999(E)
Mechanical properties of fasteners made of carbon steel and
alloy steel —
Part 1:
Bolts, screws and studs
1 Scope
This part of ISO 898 specifies the mechanical properties of bolts, screws and studs made of carbon steel and alloy
steel when tested at an ambient temperature range of 10 °C to 35 °C.
Products conforming to the requirements of this part of ISO 898 are evaluated only in the ambient temperature range
and may not retain the specified mechanical and physical properties at higher and lower temperatures. Attention is
drawn to annex A which provides examples of lower yield stress and stress at 0,2 % non-proportional elongation at
elevated temperatures.
At temperatures lower than the ambient temperature range, a significant change in the properties, particularly impact
strength, may occur. When fasteners are to be used above or below the ambient temperature range it is the
responsibility of the user to ensure that the mechanical and physical properties are suitable for his particular service
conditions.
Certain fasteners may not fulfill the tensile or torsional requirements of this part of ISO 898 because of the geometry of
the head which reduces the shear area in the head as compared to the stress area in the thread such as countersunk,
raised countersunk and cheese heads (see clause 6).
This part of ISO 898 applies to bolts, screws and studs
 with coarse pitch thread M1,6 to M39, and fine pitch thread M8 3 1 to M39 3 3;
 with triangular ISO thread in accordance with ISO 68-1;
 with diameter/pitch combinations in accordance with ISO 261 and ISO 262;
 with thread tolerance in accordance with ISO 965-1 and ISO 965-2;
 made of carbon steel or alloy steel.
It does not apply to set screws and similar threaded fasteners not under tensile stresses (see ISO 898-5).
It does not specify requirements for such properties as
 weldability;
 corrosion-resistance;
 ability to withstand temperatures above 1 300 °C (1 250 °C for 10.9) or below 2 50 °C;
 resistance to shear stress;
 fatigue resistance.
NOTE The designation system of this part of ISO 898 may be used for sizes outside the limits laid down in this clause (e.g.
d 39 mm), provided that all mechanical requirements of the property classes are met.
.
© ISO
ISO 898-1:1999(E)
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO
898. 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 898 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.
ISO 68-1:1998, ISO general purpose screw threads – Basic profile – Part 1: Metric screw threads.
ISO 83:1976, Steel – Charpy impact test (U-notch).
ISO 261:1998, ISO general purpose metric screw threads – General plan.
ISO 262:1998, ISO general purpose metric screw threads – Selected sizes for screws, bolts and nuts.
ISO 273:1979, Fasteners – Clearance holes for bolts and screws.
ISO 724:1978, ISO general purpose metric screw threads – Basic dimensions.
ISO 898-2:1992, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts with
specified proof load values – Coarse thread.
ISO 898-5:1998,
Mechanical properties of fasteners made of carbon steel and alloy steel – Part 5: Set screws and
similar threaded fasteners not under tensile stresses.
ISO 898-7:1992, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 7: Torsional test
and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm.
ISO 965-1:1998, ISO general purpose metric screw threads – Tolerances – Part 1: Principles and basic data.
ISO 965-2:1998, ISO general purpose metric screw threads – Tolerances – Part 2: Limits of sizes for general
purpose external and internal screw threads – Medium quality.
ISO 6157-1:1988, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements.
ISO 6157-3:1988, Fasteners – Surface discontinuities – Part 3: Bolts, screws and studs for special requirements.
ISO 6506:1981, Metallic materials – Hardness test – Brinell test.
ISO 6507-1:1997, Metallic material – Hardness test – Vickers test – Part 1: Test method.
ISO 6508:1986, Metallic materials – Hardness test – Rockwell test (scales A - B - C - D - E - F - G - H - K).
ISO 6892:1998, Metallic materials – Tensile testing at ambient temperature.
3 Designation system
The designation system for property classes of bolts, screws and studs is shown in table 1. The abscissae show the
nominal tensile strength values, R , in newtons per square millimetre, while the ordinates show those of the minimum
m
elongation after fracture, A , as a percentage.
min
The property class symbol consists of two figures:
 the first figure indicates 1/100 of the nominal tensile strength in newtons per square millimetre (see 5.1 in
table 3);
 the second figure indicates 10 times the ratio between lower yield stress R (or stress at 0,2 % non-
eL
proportional elongation R ) and nominal tensile strength R (yield stress ratio).
p0,2 m, nom
© ISO
ISO 898-1:1999(E)
The multiplication of these two figures will give 1/10 of the yield stress in newtons per square millimetre.
The minimum lower yield stress R (or minimum stress at 0,2 % non-proportional elongation R ) and
eL, min. p0,2, min.
minimum tensile strength R are equal to or greater than the nominal values (see table 3).
m, min.
Materials
Table 2 specifies steels and tempering temperatures for the different property classes of bolts, screws and studs.
The chemical composition shall be assessed in accordance with the relevant ISO standards.
5 Mechanical and physical properties
When tested by the methods described in clause 8, the bolts, screws and studs shall, at ambient temperature, have the
mechanical and physical properties set out in table 3.
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