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eLibrary > BS EN ISO 898-2:2022 - TC Tracked Changes. Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with specified property classes >

BS EN ISO 898-2:2022 - TC Tracked Changes. Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with specified property classes, 2022

National foreword [Go to Page]
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.
ForewordEuropean foreword [Go to Page]
Endorsement notice
Foreword
Introduction
Fasteners — Mechanical properties of fasteners made of carbon steel and alloy steel —
Nuts with specified property classes — Coarse thread and fine pitch thread [Go to Page]
1 Scope [Go to Page]
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
3 Terms and definitions [Go to Page]
4.2.1 General
4.2.2 Regular nuts (style 1) and high nuts (style 2)
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
5.2 Property classes [Go to Page]
5.2.1 Regular nuts (style 1) and high nuts (style 2)
5.2.2 Thin nuts (style 0)
56 Design of bolt and nut assemblies [Go to Page]
Table 2 — Combination of regular nuts (style 1) and high nuts (style 2) with bolt, screw, stud property classes
6 Materials [Go to Page]
Table 3 — Steels
7 Material, heat treatment, chemical composition and steel microstructure [Go to Page]
7.1 General
7.2 Heat treatment
7.3 Chemical composition
7.4 Steel microstructure [Go to Page]
7.4.1 Non‑quenched and tempered nuts
7.4.2 Quenched and tempered nuts
7 Mechanical properties [Go to Page]
Table 4 — Proof load values for nuts with coarse thread
Table 5 — Proof load values for nuts with fine pitch thread
Table 6 — Hardness properties for nuts with coarse thread
Table 7 — Hardness properties for nuts with fine pitch thread
8 Mechanical and physical properties [Go to Page]
8.1 General
8.2 Proof load
8.3 Hardness
8.4 Surface integrity
89 Inspection [Go to Page]
8.19.1 Manufacturer's inspection
8.29.2 Supplier's inspection
8.39.3 Purchaser's inspection
9.4 Delivery of test results
910 Test methods [Go to Page]
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 [Go to Page]
Figure 1 — Axial tensile test
Table 8 — Hole diameter for the grip
Dimensions in millimetres
9.1.510.1.5 Test procedure
9.1.610.1.6 Test results and requirements
9.1.7 Requirements
9.210.2 Hardness testtests
9.2.1 Applicability [Go to Page]
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
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
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
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
10.2.6 Hardness determined in the core
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)
10.3 Steel microstructure [Go to Page]
10.3.1 General
10.3.2 Applicability
10.3.3 Test method
10.3.4 Test results and requirements
10.4 Retempering test [Go to Page]
10.4.1 General
10.4.2 Test procedure
10.4.3 Test results and requirements
10.5 Surface discontinuity inspection
10 Marking [Go to Page]
10.1 General
10.2 Identification mark of the manufacturer
10.3 Marking of property classes [Go to Page]
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)
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)
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 [Go to Page]
11.1 General requirements
11.2 Property class marking symbols for nuts with full loadability
11.3 Property class marking symbols for nuts with reduced loadability [Go to Page]
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 [Go to Page]
Figure 7 — Examples of marking for hexagon nuts with full loadability
Figure 9 — Examples of marking for hexagon nuts with reduced loadability
Figure 10 — Examples of marking for left‑hand thread
11.6 Marking of the packages (labelling) [Go to Page]
Table A.1 — Minimum heights of hexagon nuts
Table A.2 — Minimum Vickers hardness suggested for regular nuts (style 1) with D < M5
Annex A
Thread dimensions of the test mandrel [Go to Page]
Table A.1 — Thread dimensions of the proof load test mandrel — Coarse pitch thread
Table A.2 — Thread dimensions of the proof load test mandrel — Fine pitch thread [Go to Page]
Table B.1 — Thread dimensions of the proof load test mandrel — Coarse thread
Table B.2 — Thread dimensions of the proof load test mandrel — Fine pitch thread
Annex B
Design principles for nuts [Go to Page]
B.1 Basic design principles for nuts [Go to Page]
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.
Table B.1 — Minimum height of standard hexagon nuts (without flange and without prevailing torque feature)
B.2 Nuts with diameters D < 5 mm and D > 39 mm
Annex C
Stress under proof load, SP [Go to Page]
Table C.1 — Stress under proof load, SP — Coarse pitch thread
Bibliography
30464638Tracked_Changes_Cover_Markup_new.pdf [Go to Page]
compares BS EN ISO 898-2:2022 [Go to Page]
TRACKED CHANGES
Text example 1 — indicates added text (in green)
30401616.pdf [Go to Page]
National foreword
European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Designation systems [Go to Page]
5.1 Nut styles
5.2 Property classes [Go to Page]
5.2.1 Regular nuts (style 1) and high nuts (style 2)
5.2.2 Thin nuts (style 0)
6 Design of bolt and nut assemblies
7 Material, heat treatment, chemical composition and steel microstructure [Go to Page]
7.1 General
7.2 Heat treatment
7.3 Chemical composition
7.4 Steel microstructure [Go to Page]
7.4.1 Non-quenched and tempered nuts
7.4.2 Quenched and tempered nuts
8 Mechanical and physical properties [Go to Page]
8.1 General
8.2 Proof load
8.3 Hardness
8.4 Surface integrity
9 Inspection [Go to Page]
9.1 Manufacturer's inspection
9.2 Supplier's inspection
9.3 Purchaser's inspection
9.4 Delivery of test results
10 Test methods [Go to Page]
10.1 Proof load test [Go to Page]
10.1.1 General
10.1.2 Applicability
10.1.3 Apparatus
10.1.4 Testing device
10.1.5 Test procedure
10.1.6 Test results and requirements
10.2 Hardness tests [Go to Page]
10.2.1 General
10.2.2 Applicability
10.2.3 Test methods
10.2.4 Test procedures for routine inspection
10.2.5 Hardness determined in the thread
10.2.6 Hardness determined 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)
10.3 Steel microstructure [Go to Page]
10.3.1 General
10.3.2 Applicability
10.3.3 Test method
10.3.4 Test results and requirements
10.4 Retempering test [Go to Page]
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 [Go to Page]
11.1 General requirements
11.2 Property class marking symbols for nuts with full loadability
11.3 Property class marking symbols for nuts with reduced loadability
11.4 Manufacturer’s identification mark
11.5 Nut marking
11.6 Marking of the packages (labelling)
Annex A (normative) Thread dimensions of the test mandrel
Annex B (informative) Design principles for nuts
Annex C (informative) Stress under proof load, SP
Bibliography [Go to Page]

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