ISO 898-3:2018 炭素鋼および合金鋼で作られたファスナーの機械的特性—パート3：指定された特性クラスの平ワッシャー | ページ 2

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 ).

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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.

Introduction

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 studs with specified property classes — Coarse thread and fine pitch thread
• Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread
• Part 5: Set screws and similar threaded fasteners with specified hardness classes — Coarse thread and fine pitch thread
• Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm

This document in the ISO 898 series provides a single point of reference for flat washers, in order to standardize market expectations for users, distributors and manufacturers.

This document only deals with flat washers made of carbon steel or alloy steel.

Washers made of stainless steel are not addressed in this document due to their different characteristics and test methods.

1 Scope

This document specifies mechanical and physical properties of flat washers, designed to be used in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in accordance with ISO 898-1 and ISO 898-2.

Washers that conform to the requirements of this document are evaluated at an ambient temperature range of 10 °C to 35 °C. They might not retain the specified mechanical and physical properties at elevated temperatures and/or lower temperatures.

This document is applicable to the following flat captive and non-captive washers made of carbon steel or alloy steel, with thickness from 0,2 mm to 12 mm:

• plain washers (with or without knurls, ribs or chamfers);
• square washers;
• square hole washers;
• shaped plates.

It does not specify requirements for the following properties:

• corrosion resistance;
• weldability.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography