BS EN ISO 898-2:2022 – TC

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Tracked Changes. Fasteners. Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts with specified property classes

Published By	Publication Date	Number of Pages
BSI	2022	100

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Categories: 21.060.20 - Nuts, BSI

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Description

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.

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PDF Pages	PDF Title
1	compares BS EN ISO 898-2:2022
2	TRACKED CHANGES Text example 1 — indicates added text (in green)
3	National foreword This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Contractual and legal considerations Compliance with a British Standard cannot confer immunity from legal obligations.
5	ForewordEuropean foreword Endorsement notice
8	Foreword
11	Introduction
12	Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel — Nuts with specified property classes — Coarse thread and fine pitch thread 1 Scope
13	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 +3… 2 Normative references
14	3 Terms and definitions 4.2.1 General 4.2.2 Regular nuts (style 1) and high nuts (style 2)
15	4.2.3 Thin nuts (style 0) Table 1 — Ranges of nominal diameters in relation to nut style and property class 5.1 Nut styles
16	5.2 Property classes 5.2.1 Regular nuts (style 1) and high nuts (style 2) 5.2.2 Thin nuts (style 0)
17	56 Design of bolt and nut assemblies Table 2 — Combination of regular nuts (style 1) and high nuts (style 2) with bolt, screw, stud property classes 6 Materials
18	Table 3 — Steels 7 Material, heat treatment, chemical composition and steel microstructure 7.1 General
19	7.2 Heat treatment 7.3 Chemical composition
21	7.4 Steel microstructure 7.4.1 Non‑quenched and tempered nuts 7.4.2 Quenched and tempered nuts
22	7 Mechanical properties Table 4 — Proof load values for nuts with coarse thread
23	Table 5 — Proof load values for nuts with fine pitch thread Table 6 — Hardness properties for nuts with coarse thread
24	Table 7 — Hardness properties for nuts with fine pitch thread 8 Mechanical and physical properties 8.1 General 8.2 Proof load
26	8.3 Hardness
28	8.4 Surface integrity 89 Inspection 8.19.1 Manufacturer’s inspection 8.29.2 Supplier’s inspection 8.39.3 Purchaser’s inspection
29	9.4 Delivery of test results 910 Test methods 9.110.1 Proof load test 9.1.110.1.1 General 9.1.210.1.2 Applicability 9.1.310.1.3 Apparatus 9.1.410.1.4 Testing device
30	Figure 1 — Axial tensile test
31	Table 8 — Hole diameter for the grip Dimensions in millimetres
32	9.1.510.1.5 Test procedure 9.1.610.1.6 Test results and requirements 9.1.7 Requirements
33	9.210.2 Hardness testtests 9.2.1 Applicability 9.2.2 Test methods 9.2.3 Test procedures 9.2.3.1 Test load for hardness determination 9.2.3.2 Hardness determined on a surface 9.2.3.3 Hardness determined on a longitudinal section
34	9.2.4 Requirements 9.2.4.1 Quenched and tempered nuts 9.2.4.2 Non-quenched and tempered nuts 10.2.1 General Table 12 — Summary of hardness requirements 10.2.2 Applicability
35	10.2.3 Test methods 10.2.4 Test procedures for routine inspection a) Hardness determined on the bearing surface b) Hardness determined on the transverse section
36	Figure 4 — Hardness determination on the transverse section 10.2.5 Hardness determined in the thread Table 13 — Selection of appropriate test force for Vickers hardness test
37	10.2.6 Hardness determined in the core
38	Figure 6 — Hardness determination in the core 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)
39	10.3 Steel microstructure 10.3.1 General 10.3.2 Applicability 10.3.3 Test method 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
40	10.5 Surface discontinuity inspection 10 Marking 10.1 General 10.2 Identification mark of the manufacturer 10.3 Marking of property classes 10.3.1 General 10.3.2 Regular nuts (style 1) and high nuts (style 2) Table 9 — Marking symbols of property classes for regular nuts (style 1) and high nuts (style 2)
41	10.3.3 Thin nuts (style 0) Table 10 — Marking symbols of property classes for thin nuts (style 0) 10.4.1 Hexagon nuts Figure 5 — Examples of marking with clock-face system (alternative marking)
42	10.4.2 Other type of nuts Figure 6 — Marking of left-hand thread Figure 7 — Alternative marking of left-hand thread 11 Marking and labelling 11.1 General requirements
43	11.2 Property class marking symbols for nuts with full loadability
44	11.3 Property class marking symbols for nuts with reduced loadability Table 15 — Property class marking symbols for nuts with reduced loadability (e.g. thin nuts) 11.4 Manufacturer’s identification mark 11.5 Nut marking Figure 7 — Examples of marking for hexagon nuts with full loadability
45	Figure 9 — Examples of marking for hexagon nuts with reduced loadability Figure 10 — Examples of marking for left‑hand thread
46	11.6 Marking of the packages (labelling)
48	Table A.1 — Minimum heights of hexagon nuts Table A.2 — Minimum Vickers hardness suggested for regular nuts (style 1) with D < M5
50	Annex A Thread dimensions of the test mandrel Table A.1 — Thread dimensions of the proof load test mandrel — Coarse pitch thread
51	Table A.2 — Thread dimensions of the proof load test mandrel — Fine pitch thread
52	Table B.1 — Thread dimensions of the proof load test mandrel — Coarse thread
53	Table B.2 — Thread dimensions of the proof load test mandrel — Fine pitch thread
54	Annex B Design principles for nuts B.1 Basic design principles for nuts WARNING — Nuts on the market showing vertical bars on each side of the property class symbol (e.g. \|8\| ) do not fulfil the requirements of this document.
55	Table B.1 — Minimum height of standard hexagon nuts (without flange and without prevailing torque feature) B.2 Nuts with diameters D 39 mm
56	Annex C Stress under proof load, SP Table C.1 — Stress under proof load, SP — Coarse pitch thread
58	Bibliography
62	National foreword
64	European foreword
67	Foreword
69	Introduction
71	1 Scope
72	2 Normative references 3 Terms and definitions 4 Symbols
73	5 Designation systems 5.1 Nut styles 5.2 Property classes 5.2.1 Regular nuts (style 1) and high nuts (style 2)
74	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
75	7.2 Heat treatment 7.3 Chemical composition
77	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
78	8.3 Hardness
80	8.4 Surface integrity 9 Inspection 9.1 Manufacturer’s inspection 9.2 Supplier’s inspection 9.3 Purchaser’s inspection
81	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
82	10.1.5 Test procedure
83	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
85	10.2.5 Hardness determined in the thread
86	10.2.6 Hardness determined in the core
87	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
88	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
89	11.2 Property class marking symbols for nuts with full loadability
90	11.3 Property class marking symbols for nuts with reduced loadability 11.4 Manufacturer’s identification mark 11.5 Nut marking
92	11.6 Marking of the packages (labelling)
93	Annex A (normative) Thread dimensions of the test mandrel
95	Annex B (informative) Design principles for nuts
97	Annex C (informative) Stress under proof load, SP
99	Bibliography

Additional information

Status	Definitive
Pages	100
Publication Date	2022-11-22
ISBN	978 0 539 24643 8
Standard Number	BS EN ISO 898-2:2022 – TC
Title	Tracked Changes. Fasteners. Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts with specified property classes
Descriptors	Unalloyed steels, Proof loading, Testing conditions, Threads, Chemical composition, Thread pitch, Low-alloy steels, Mechanical properties of materials, Nuts, Threaded fasteners, Hardness, Hexagonal-head fasteners, Bolted joints, Grades (quality), Screwed joints, Diameter, Failure (mechanical), Tensile strength, Mechanical testing, Alloy steels, Fasteners, Proof stress, Designations, Hardness testing, Internal-thread fasteners, Steels
Publisher	BSI
Committee	FME/9
ICS Codes	21.060.20 - Nuts

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