... :2008,ROHS 4.Standard:GB,DIN,JIS,ANSI plain washer/spring lock washer stainless steel/zp Product name Galvanized flat washers ... .Standard ISO,GB,DIN,JIS,ANSICetificate ISO9001-2008,SGS,ROHS Function Aatomobile,electronic,mechinery After sale serviceIf there are unqualified,we ... for it. superiority Good quality,free for samples. plain washer/spring lock washer stainless steel/zp