ISO INTERNATIONAL STANDARD 898-3 First edition 2018-05 Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes Caracteristiques mécaniques des fixations en acier au carbone et en acierallié Partie 3: Rondelles de forme plane de classes de qualité spécifiées Reference number ISO 898-3:2018(E) so @ IS0 2018 IS0 898-3:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normativereferences ..1 3 Terms and definitions ..2 4 Symbols ..2 5 Designation system for property classes of washers and combination with property classes of bolts, screws, studs and nuts .2 6 Materials ..3 7 Mechanical and physical properties ..4 8 Test methods. .5 8.1 Hardnesstest .5 8.1.1 General .5 8.1.2 Hardness test on the washer bearing surface .6 8.1.3 Hardness determined on a transverse radial section through the washer .9 8.2 Decarburization test. 10 8.2.1 General .10 8.2.2 Microscopic method. 10 8.2.3 Hardness method. 11 8.3 Carburization test. 12 8.3.1 General. 12 8.3.2 Test procedure .12 8.3.3 Requirements .12 8.4 Retempering test. .12 8.4.1 General 12 8.4.2 Test procedure .12 8.4.3 Requirements .12 9 Marking .13 9.1 General. .13 9.2 Marking of washers. .13 9.3 Marking of packages. ..13 Annex A (normative) Ductility test for washers of property class 38oHV .14 Bibliography .17 @ IS0 2018 - All rights reserved iii IS0 898-3:2018(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) Attention is drawn to the possibility that some of the elements of this document may be the subject of any patent rights identified during the development of the document will be in the Introduction and/or on the Iso list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about Iso's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html This document was prepared by Technical Committee ISo/TC 2, Fasteners. A list of all parts in the ISO 898 series can be found on the ISO website. iv @ IS0 2018 - All rights reserved