M4 200HV Flat Plain Washer ISO 7089 in A2 Stainless

Simple flat washer, similar to DIN 125 Form A type, but made to the newer ISO 7089 standard. Washers are used in nut and bolt assemblies to improve stress distribution on the bearing surface and span large clearance holes. These washers are as standard 200HV hardness grade suitable for hex head bolts, screws and nuts in property classes up to and including grade 8.8. They are also suitable for case-hardened thread rolling screws. Harder 300HV washers also available for use with hex head bolts, screws and nuts in property classes up to and including grade 10.9. They are also suitable for through hardened socket head cap screws, bolts and nuts.