National Standard: GB96,GB97,GB97.2,GB848,GB853,GB1230,GB9074.24
Germany Standard: DIN125A,125B,DIN126,DIN436,DIN25201,DIN9021,etc.
American Standard: ASTMF436
International Standard: ISO7089,ISO7090,ISO7091,ISO7093,etc.
A. Carbon steel,Tempering steel,Special alloys, further stamping material on request
B. 304;304M;304B;304HC;304L;316;316L, etc.
Zinc、Yellow Zinc、Mechanical Galvanizing、Hot dipped galvanizing、Dacromet、Chrome plating
Non-standard washer can be customized