INTERNATIONAL STANDARD
Partie 2: Ecrous de classes de qualite specifiees
Fasteners-Mechanicalproperties offastenersmadeofcarbonsteeland alloy steel
Part 2:Nutswithspecifiedpropertyclasses
Fixations - Caracteristiques mecaniques des fixations en acier aucarbone et en acier allie -
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Contents
Page
5.1 Nut styles. 35.2 5.2.1 Property classes. Regular nuts (style 1) and high nuts (style 2)5.2.2 Thin nuts (style 0). 3
Material heat treatment chemical position and steel microstructure. 7.1 General.7.2 Heat treatment. 5 47.3 7.4 Steel microstructure Chemical position. 5 77.4.1 7.4.2 Quenched and tempered nuts. Non-quenched and tempered nuts. 77
8 Mechanical and physical properties. 7
8.1 General. 78.2 8.3 Proof load Hardness. 6” 88.4 Surface integrity. 11
11
Inspection. 9.1 Manufacturer's inspection. 119.2 Purchaser's inspection. Supplier's inspection.. 119.4 Delivery of test results. 12 11
10 Test methods. 12
10.1 Proof load test. 10.1.1 General. 12 1210.1.2 10.1.3 Applicability Apparatus. 12 1210.1.4 Testing device. 1210.1.5 10.1.6 Test procedure. Test results and requirements. 13 1410.2 10.2.1 Hardness tests. General 14 1410.2.2 Applicability 1410.2.3 Test methods. 10.2.4 Test procedures for routine inspection. 14 1410.2.6 Hardness determined in the core. 10.2.5 Hardness determined in the thread. 16 1710.2.7 Uniformity of hardness for quenched and tempered nuts (QT) 1810.2.8 10.2.9 Requirements for quenched and tempered nuts (QT). Requirements for non-quenched and tempered nuts (NQT). 18 1810.3 Steel microstructure. 1910.3.2 Applicability 10.3.1 General 19 19
10.3.4 Test results and requirements. 10.3.3 Test method 19 1910.4 Retempering test. 1910.4.2 Test procedure 10.4.1 General 19 1910.5 10.4.3 Test results and requirements. Surface discontinuity inspection. 20 20
Marking and labelling.11.2 11.1 Property class marking symbols for nuts with fulloadability. General requirements 20 2011.3 Property class marking symbols for nuts with reduced loadability. 2111.5 11.4 Nut marking Manufacturer's identification mark. 21 2111.6 Marking of the packages (labelling). 23
Annex C (informative) Stress under proof load Sp 29
Bibliography. 31
Foreword
bodies (ISO member bodies). The work of preparing International Standards is normally carried outthrough ISO technical mittees. Each member body interested in a subject for which a technical mittee has been established has the right to be represented on that mittee. InternationalISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters;of organizations governmental and non-governmental in liaison with ISo also take part in the work.electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance aredifferent types of ISo documents should be noted. This document was drafted in accordance with theeditorial rules of the ISO/IEC Directives Part 2 (see
Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent 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/oron the ISo list of patent declarations received (see
Any trade name used in this document is information given for the convenience of users and does notconstitute an endorsement.
expressions related to conformity assessment as well as information about ISO's adherence tothe World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
This document was prepared by Technical Committee ISO/TC 2 Fasteners Submitte SC 12 Fasteners with metric internalthread in collaboration with the European Committee for Standardization(CEN) Technical Committee CEN/TC 185 Fasteners in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 898-2:2012) which has been technicallyrevised.
The main changes are as follows:
property class 9 has been deleted pletely and nuts with fine pitch thread and property class 5
have been deleted (see Introduction);39 mm (see Tables 4 6 and 10);styles have been more precisely specified for standard hexagon nuts according to their minimumheight (see 5.1);- additional statements for thin nuts and jam nuts have been added (see Clause 6); additional statements for hot dip galvanized nuts have been added by referencing ISO 10684;- the minimum carbon content has been added (see Tables 3 and 4) .the minimum manganese content has been specified to 0 25 % for all Non-Quenched andTempered nuts (NQT) and has been raised to 0 45 % for all Quenched and Tempered nuts (QT) (see Tables 3 and 4) - the table footnote for free cutting steel has been reworked (see Tables 3 and 4)
nuts with fine pitch thread in style 2 and property class 12 have been added for diameters 18 mm to
height and styles have been specified for other nuts according to their minimum design thread
- in relation to material heat treatment and steel microstructure (see Clause 7):
