... Washers Washer StandardDIN125, DIN127, DIN9021, DIN7349 ,DIN7980, DIN433, DIN440 Washer Material AMS5596 , Inconel 718, sus 304, sus 303, sus 302, C1010 ... Mill test certification and etc as per your need. D.Factory general impression Tangxia shuangxin hardware Dongguan ,GuangdongFactory Locationtangxia town, dongguan ...