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BS EN ISO 898-2:2022

BS EN ISO 898-2:2022

$167.15

Fasteners. Mechanical properties of fasteners made of carbon steel and alloy steel – Nuts with specified property classes

Published By Publication Date Number of Pages
BSI 2022 40
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This document specifies the mechanical and physical properties of nuts made of non-alloy steel or alloy steel, when tested at the ambient temperature range of 10 °C to 35 °C. This document applies to nuts: —    with ISO metric thread (see ISO 68-1), —    with diameter/pitch combinations according to ISO 261 and ISO 262, —    with coarse pitch thread M5 to M39, and fine pitch thread M8×1 to M39×3, —    with thread tolerances according to ISO 965-1, ISO 965-2 or ISO 965-5, —    with specified property classes 04, 05, 5, 6, 8, 10 and 12 including proof load, —    of three different nut styles (see 5.1): regular nuts (style 1), high nuts (style 2) and thin nuts (style 0), —    with a minimum outside diameter or width across flats s ? 1,45D, —    able to mate with bolts, screws and studs with property classes in accordance with ISO 898-1 (see Annex B), and —    intended to be used in applications ranging from –50 °C to +150 °C, or up to +300 °C. WARNING — Nuts conforming to the requirements of this document are tested at the ambient temperature range of 10 °C to 35 °C and are used in applications ranging from –50 °C to +150 °C; however, these nuts are also used outside this range and up to +300 °C for specific applications. It is possible that they do not retain the specified mechanical and physical properties at lower and/or elevated temperatures. Therefore, it is the responsibility of the user to determine the appropriate choices based on the service environment conditions of the assembly (see also 7.1). For additional specifications applicable to hot dip galvanized nuts, see ISO 10684. For nuts designed for particular applications, see ISO/TR 16224. This document does not specify requirements for functional properties such as: —    prevailing torque properties (see ISO 2320), —    torque/clamp force properties (see ISO 16047 for test method), —    weldability, or —    corrosion resistance.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
7 Foreword
9 Introduction
11 1 Scope
12 2 Normative references
3 Terms and definitions
4 Symbols
13 5 Designation systems
5.1 Nut styles
5.2 Property classes
5.2.1 Regular nuts (style 1) and high nuts (style 2)
14 5.2.2 Thin nuts (style 0)
6 Design of bolt and nut assemblies
7 Material, heat treatment, chemical composition and steel microstructure
7.1 General
15 7.2 Heat treatment
7.3 Chemical composition
17 7.4 Steel microstructure
7.4.1 Non-quenched and tempered nuts
7.4.2 Quenched and tempered nuts
8 Mechanical and physical properties
8.1 General
8.2 Proof load
18 8.3 Hardness
20 8.4 Surface integrity
9 Inspection
9.1 Manufacturer’s inspection
9.2 Supplier’s inspection
9.3 Purchaser’s inspection
21 9.4 Delivery of test results
10 Test methods
10.1 Proof load test
10.1.1 General
10.1.2 Applicability
10.1.3 Apparatus
10.1.4 Testing device
22 10.1.5 Test procedure
23 10.1.6 Test results and requirements
10.2 Hardness tests
10.2.1 General
10.2.2 Applicability
10.2.3 Test methods
10.2.4 Test procedures for routine inspection
25 10.2.5 Hardness determined in the thread
26 10.2.6 Hardness determined in the core
27 10.2.7 Uniformity of hardness for quenched and tempered nuts (QT)
10.2.8 Requirements for non-quenched and tempered nuts (NQT)
10.2.9 Requirements for quenched and tempered nuts (QT)
10.3 Steel microstructure
10.3.1 General
10.3.2 Applicability
10.3.3 Test method
28 10.3.4 Test results and requirements
10.4 Retempering test
10.4.1 General
10.4.2 Test procedure
10.4.3 Test results and requirements
10.5 Surface discontinuity inspection
11 Marking and labelling
11.1 General requirements
29 11.2 Property class marking symbols for nuts with full loadability
30 11.3 Property class marking symbols for nuts with reduced loadability
11.4 Manufacturer’s identification mark
11.5 Nut marking
32 11.6 Marking of the packages (labelling)
33 Annex A (normative) Thread dimensions of the test mandrel
35 Annex B (informative) Design principles for nuts
37 Annex C (informative) Stress under proof load, SP
39 Bibliography

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BS EN ISO 898-2:2022
$167.15