ISO 3506-2:2020
Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts with specified grades and property classes
Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts with specified grades and property classes
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 27
- Дата публикации:
- 6 апреля 2020 г.
- Издание:
- ISO IS 3506 edition 3 version 1
- ICS:
- 21.060.20
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[1] 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 ≥ 0,45D, — with a minimum outside diameter or width across flats s ≥ 1,45D (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 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. [1] Under preparation.
Abstract
Overview
ISO 3506-2:2020 specifies the mechanical and physical properties of nuts made from corrosion-resistant stainless steels. It covers nuts with ISO metric threads (coarse and fine) tested at ambient temperatures (10 °C to 35 °C) and defines property classes for austenitic, martensitic, ferritic and duplex (austenitic‑ferritic) stainless steels. The standard applies to nuts M5 to M39 (coarse) and M8×1 to M39×3 (fine), various nut styles (thin, regular, high) and a range of shapes and sizes, with minimum geometric limits (height m ≥ 0.45D; outside diameter/width across flats s ≥ 1.45D).
Key topics and technical requirements
- Property classes and grades: Defines how nuts relate to stainless steel grades (including new duplex grades and property class 100 additions) and specifies proof load requirements.
- Test conditions: Mechanical and physical properties are evaluated at ambient temperature (10–35 °C). Note: typical unrestricted use is –20 °C to +150 °C; use outside this range requires expert assessment.
- Thread and dimensional scope: Applies to ISO metric threads per ISO 68‑1 and diameter/pitch combinations per ISO 261/262; thread tolerances per ISO 965‑1/2.
- Nut styles: Classification and designation for thin (reduced loadability), regular and high nuts, including marking rules for each style.
- Mechanical tests: Proof load and hardness test procedures, test mandrel/thread dimensions, and requirements for inspection, manufacturer/supplier/purchaser testing and delivery of test results.
- Marking and labelling: Mandatory marking practices (property class, manufacturer ID, left‑hand thread, package labelling).
- Material and finish: Chemical composition limits, heat treatment for martensitic nuts, corrosion resistance considerations and surface finish guidance.
- Design guidance: Design principles for stainless steel nuts and design of bolt‑nut assemblies (Annex A and Clause 6).
Practical applications and users
ISO 3506-2:2020 is used by:
- Fastener manufacturers and quality managers for production control and certification.
- Engineers and designers specifying stainless steel nuts for construction, marine, chemical, petrochemical, and food processing equipment where corrosion resistance and mechanical performance are critical.
- Procurement and inspection personnel to verify compliance (proof load, marking, test reports).
- Metallurgists and application specialists advising on suitability for high/low temperature or aggressive environments.
Related standards
- ISO 3506‑1 (bolts, screws, studs)
- ISO 3506‑6 (general rules for selection of stainless steels) - essential for temperature/grade guidance
- ISO 68‑1, ISO 261, ISO 262 (thread geometry)
- ISO 965‑1 / ISO 965‑2 (thread tolerances)
- ISO 898‑2 (alignment of structure/content)
Keywords: ISO 3506-2:2020, stainless steel nuts, corrosion-resistant fasteners, property classes, proof load, ISO metric thread, duplex stainless steel.
Технические детали
- Технический комитет
- ISO/TC 2 - Fasteners
- SKU
- ISO 3506-2:2020
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