ISO/DIS 3506-7

Fasteners — Mechanical properties of corrosion-resistant stainless-steel fasteners — Part 7: Flat washers with specified grades and property classes

General information

40.20 DIS ballot initiated: 12 weeks   Feb 23, 2023


ISO/TC 2 Fasteners

International Standard

21.060.30   Washers, locking elements



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This document specifies grades and mechanical and physical properties of flat washers made of austenitic, ferritic and duplex steel grades, designed to be used in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in accordance with ISO 3506-1 and ISO 3506-2.
These types of washers may also be used with other fasteners such as screws forming their own mating thread
This part of ISO 3506 is applicable to the following flat captive and non captive washers made of corrosion-resistant stainless steel:
— plain washers (with or without knurls, ribs or chamfers);
— square washers;
— square hole washers;
— shaped plates.

Life cycle


ISO/DIS 3506-7
40.20 DIS ballot initiated: 12 weeks
Feb 23, 2023