Specification: DIN,ANSI, BS, such as DIN125,DIN9021,DIN433,DIN126,DIN440,DIN1440,DIN1441,DIN1052,DIN7349,DIN7989,BS4320,BS341 Description: flat washer, ... ) Specification: DIN,ANSI, BS, such as DIN125,DIN9021,DIN433,DIN126,DIN440,DIN1440,DIN1441,DIN1052,DIN7349,DIN7989,BS4320,BS3410,SAS,and USS ...