we supply all kinds of washer ,standard of as per customer's drawingdin7989 spring washer1 standard: all kinds of DIN;NFE;ASTM;USS;SAE;FW;AS;refer to the customers' drawing2.materail;mid steel carbon steel ,spring steel,stainless steel ;copper;alloy steel3: surface; plain black zinc plated(ZP CR+3; ZP CR+6;BZP;YZP;HDG)chorme-coated;nickel_coated4 packing;small box;bag;carton (15kg or 20kg or 25 kg) then36 /48/ 60 cartons on a pallet