BS EN ISO 3506-2:2020 – TC
$217.84
Tracked Changes. 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 | 92 |
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.
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.
ISO 3506-5 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 |
|---|---|
| 1 | compares BS EN ISO 3506-2:2020 |
| 2 | TRACKED CHANGES Text example 1 — indicates added text (in green) |
| 3 | National foreword Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication |
| 8 | Foreword |
| 10 | Introduction |
| 11 | Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: 1 Scope |
| 13 | 2 Normative references |
| 14 | 3 Terms and definitions 3.1 3.2 3.3 3.4 3.5 34 Symbols |
| 15 | 45 Designation, marking and finish systems 4.1 Designation |
| 16 | Figure 1 — Designation system for stainless steel grades and property classes for nuts 4.2 Marking 4.2.2 Manufacturer’s identification mark |
| 17 | 4.2.3 Nuts Figure 2 — Marking with material designation and manufacturer’s identification mark |
| 18 | 4.2.4 Packages 4.3 Finish 5.1 Designation of nut styles 5.2 Designation system for stainless steel grades and property classes 5.2.1 General |
| 19 | Figure 1 — Designation system for stainless steel grades and property classes for nuts 5.2.2 Designation of stainless steel grades (first block) |
| 20 | 5.2.3 Designation of property classes (second block) for regular nuts (style 1) and high nuts 5.2.4 Designation of property classes (second block) for thin nuts (style 0) 5 Chemical composition |
| 21 | Table 1 — Stainless steel grades — Chemical composition 6 Design of bolt and nut assemblies Table 1 — Property class combination of nuts to bolts, screws and studs |
| 22 | 6 Mechanical properties Table 2 — Mechanical properties for nuts — Austenitic steel grades |
| 23 | 7 Materials 7.1 Chemical composition |
| 24 | Table 2 — Stainless steel grades — Chemical composition 7.2 Heat treatment for martensitic stainless steel nuts |
| 25 | 7.3 Finish 7.4 Corrosion resistance 8 Mechanical and physical properties |
| 26 | Table 3 — Mechanical properties for nuts — Austenitic and duplex grades Table 4 — Mechanical properties for nuts — Martensitic and ferritic grades |
| 27 | Table 5 — Proof load values for regular and high nuts with coarse pitch thread (full loadability) Table 6 — Proof load values for regular and high nuts with fine pitch thread (full loadability) |
| 28 | Table 7 — Proof load values for thin nuts with coarse pitch thread (reduced loadability) Table 8 — Proof load values for thin nuts with fine pitch thread (reduced loadability) |
| 29 | 9 Inspection 9.1 Manufacturer’s inspection 9.2 Supplier’s inspection 9.3 Purchaser’s inspection 9.4 Delivery of test results 710 Test methods 7.1 Hardness HB, HRC or HV 7.2 Proof load |
| 30 | 10.1 Proof load test 10.1.1 General 10.1.2 Applicability 10.1.3 Apparatus 10.1.4 Testing device |
| 31 | Figure 2 — Axial tensile test Figure 3 — Axial compressive test |
| 32 | 10.1.5 Test procedure 10.1.6 Addition to test procedure for prevailing torque nuts 10.1.7 Test results and requirements |
| 33 | 10.2 Hardness test 10.2.1 General 10.2.2 Test procedure Hardness determined on a surface Hardness determined on a longitudinal section (core hardness) Figure 4 — Location of hardness readings (longitudinal section) |
| 34 | 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) Table 10 — Property class marking symbol for nuts with full loadability (regular and high nuts) 11.1.3 Marking of property class for nuts with reduced loadability (thin nuts) |
| 35 | Table 11 — Property class marking symbol 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 |
| 36 | Figure 5 — Examples of marking for hexagon nuts with full loadability Figure 6 — Examples of marking for hexagon nuts with reduced loadability |
| 37 | Figure 7 — Alternative groove marking (for grades A2 and A4 only) 11.3.2 Other types of nuts 11.3.3 Left-hand thread marking Figure 8 — Example of marking for left-hand thread 11.4 Marking of the packages (labelling) |
| 38 | (informative) A.1 General A.2 Steel group A (austenitic structure) A.2.1 General A.2.2 Steel grade A1 |
| 39 | A.2.3 Steel grade A2 A.2.4 Steel grade A3 A.2.5 Steel grade A4 A.2.6 Steel grade A5 A.3 Steel group F (ferritic structure) A.3.1 General A.3.2 Steel grade F1 A.4 Steel group C (martensitic structure) A.4.1 General A.4.2 Steel grade C1 A.4.3 Steel grade C3 |
| 40 | A.4.4 Steel grade C4 A.5 Steel group FA (ferritic-austenitic structure) Table A.1 — Examples of compositions of steels with ferritic-austenitic structure |
| 41 | (informative) |
| 42 | Table A.1 — Minimum height of hexagon nuts A.2 Nuts with diameters D 39 mm |
| 43 | Annex B (informative) |
| 44 | Table B.1 — Stainless steel composition specifications |
| 46 | Annex B (normative) Table B.1 — Thread dimensions of the test mandrel – Coarse pitch thread |
| 47 | Table B.2 — Thread dimensions of the test mandrel — Fine pitch thread |
| 48 | Annex C (informative) |
| 49 | Table C.1 — Stainless steels for cold heading and extruding |
| 50 | Annex D (informative) Table D.1 — Austenitic stainless steels with particular resistance to chloride induced stress corrosion |
| 51 | Table E.1 — Influence of temperature on ReL and Rp0,2 Table E.2 — Application of stainless steel bolts, screws and studs at low temperatures |
| 52 | Annex F (informative) Figure F.1 — Time-temperature diagram of intergranular corrosion in austenitic stainless steels, grade A2 |
| 53 | Annex G (informative) |
| 54 | Bibliography |
| 56 | undefined |
| 58 | European foreword Endorsement notice |
| 61 | Foreword |
| 63 | Introduction |
| 65 | 1 Scope |
| 66 | 2 Normative references 3 Terms and definitions |
| 67 | 4 Symbols |
| 68 | 5 Designation systems 5.1 Designation of nut styles 5.2 Designation system for stainless steel grades and property classes 5.2.1 General |
| 69 | 5.2.2 Designation of stainless steel grades (first block) |
| 70 | 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 |
| 71 | 7 Materials 7.1 Chemical composition |
| 72 | 7.2 Heat treatment for martensitic stainless steel nuts |
| 73 | 7.3 Finish 7.4 Corrosion resistance 8 Mechanical and physical properties |
| 78 | 9 Inspection 9.1 Manufacturer’s inspection 9.2 Supplier’s inspection |
| 79 | 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 |
| 81 | 10.1.5 Test procedure 10.1.6 Addition to test procedure for prevailing torque nuts 10.1.7 Test results and requirements |
| 82 | 10.2 Hardness test 10.2.1 General 10.2.2 Test procedure |
| 83 | 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) |
| 84 | 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 |
| 86 | 11.3.2 Other types of nuts 11.3.3 Left-hand thread marking 11.4 Marking of the packages (labelling) |
| 87 | Annex A (informative) Design principles of stainless steel nuts |
| 89 | Annex B (normative) Thread dimensions of the test mandrel for proof load |
| 91 | Bibliography |
Related products
-
BS EN ISO 3506-2:2020
Fasteners. Mechanical properties of corrosion-resistant stainless steel fasteners – Nuts with specified grades and property…
