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BS EN ISO 3506-2:2020

BS EN ISO 3506-2:2020

$167.15

Fasteners. Mechanical properties of corrosion-resistant stainless steel fasteners – Nuts with specified grades and property classes

Published By Publication Date Number of Pages
BSI 2020 38
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This document specifies the mechanical and physical properties of nuts, with coarse pitch thread and fine pitch thread, made of corrosion-resistant stainless steels, when tested at the ambient temperature range of 10 °C to 35 °C. It specifies property classes in relation to austenitic, martensitic, ferritic and duplex (austenitic-ferritic) steel grades for nuts.

ISO 3506-6 provides general rules and additional technical information on suitable stainless steels and their properties.

Nuts conforming to the requirements of this document are evaluated at the ambient temperature specified in paragraph 1. It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lower temperatures.

NOTE 1

Fasteners conforming to the requirements of this document are used without restriction in applications ranging from –20 °C to +150 °C; however, fasteners conforming to this document are also used for applications outside this range down to –196 °C and up to +300 °C. For more details, see ISO 3506-6 .

Outside the temperature range of –20 °C to +150 °C, it is the responsibility of the user to determine the appropriate choice for a given application, in consultation with an experienced fastener metallurgist and by taking into account e.g. stainless steel composition, duration of exposure at elevated or low temperature, the effect of the temperature on the fastener mechanical properties and clamped parts, and the corrosive service environment of the bolted joint.

NOTE 2

ISO 3506-5 3

3

Under preparation.

is developed in order to assist in the selection of appropriate stainless steel grades and property classes intended for use at temperatures up to +800 °C.

This document applies to nuts:

  • with ISO metric thread in accordance with ISO 68-1 ,

  • with diameter/pitch combinations in accordance with ISO 261 and ISO 262 ,

  • with coarse pitch thread M5 to M39, and fine pitch thread M8×1 to M39×3,

  • with thread tolerances in accordance with ISO 965-1 and ISO 965-2 ,

  • with specified property classes, including proof load,

  • with different nut styles: thin nuts, regular nuts and high nuts,

  • with a minimum nut height m ? 0,45 D,

  • with a minimum outside diameter or width across flats s ? 1,45 D (see Annex A),

  • of any shape, and

  • able to mate with bolts, screws and studs with property classes in accordance with ISO 3506-1 .

Stainless steel grades and property classes can be used for sizes outside the diameter limits of this document (i.e. for D < 5 mm or D > 39 mm), provided that all applicable chemical, mechanical and physical requirements are met.

This document does not specify requirements for functional properties such as:

  • torque/clamp force properties,

  • prevailing torque properties, or

  • weldability.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
9 Introduction
11 1 Scope
12 2 Normative references
3 Terms and definitions
13 4 Symbols
14 5 Designation systems
5.1 Designation of nut styles
5.2 Designation system for stainless steel grades and property classes
5.2.1 General
15 5.2.2 Designation of stainless steel grades (first block)
16 5.2.3 Designation of property classes (second block) for regular nuts (style 1) and high nuts (style 2)
5.2.4 Designation of property classes (second block) for thin nuts (style 0)
6 Design of bolt and nut assemblies
17 7 Materials
7.1 Chemical composition
18 7.2 Heat treatment for martensitic stainless steel nuts
19 7.3 Finish
7.4 Corrosion resistance
8 Mechanical and physical properties
24 9 Inspection
9.1 Manufacturer’s inspection
9.2 Supplier’s inspection
25 9.3 Purchaser’s inspection
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
27 10.1.5 Test procedure
10.1.6 Addition to test procedure for prevailing torque nuts
10.1.7 Test results and requirements
28 10.2 Hardness test
10.2.1 General
10.2.2 Test procedure
29 10.2.3 Test results and requirements
11 Nut marking and labelling
11.1 Nut marking
11.1.1 General requirements for marking
11.1.2 Marking of property class for nuts with full loadability (regular and high nuts)
30 11.1.3 Marking of property class for nuts with reduced loadability (thin nuts)
11.1.4 Additional marking
11.2 Manufacturer’s identification mark
11.3 Marking on the nuts
11.3.1 Hexagon nuts
32 11.3.2 Other types of nuts
11.3.3 Left-hand thread marking
11.4 Marking of the packages (labelling)
33 Annex A (informative) Design principles of stainless steel nuts
35 Annex B (normative) Thread dimensions of the test mandrel for proof load
37 Bibliography

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BS EN ISO 3506-2:2020
$167.15