ISO 898-3:2018, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 3: Flat washers with specified property classes

This part of ISO 898 specifies mechanical and physical properties of flat washers, designed to be used in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in accordance with ISO 898-1 and ISO 898-2. Washers that conform to the requirements of this part of ISO 898 are evaluated at an ambient temperature range of 10 °C to 35 °C. These washers are used in applications at low or high temperatures up to a maximum temperature of +300 °C.This part of ISO 898 is applicable to the following flat captive and non-captive washers made of carbon steel, alloy steel, spring or alloy spring steel, with thickness from 0,2 mm to 12 mm: – plain washers (with or without knurls/chamfers); – square washers; – square hole washers; – shaped plates. It does not specify requirements for such properties as: – corrosion resistance; – weldability.