... DIN, IFI, JIS, ISO,GB,ANSI 2)Washers type:flat ,spring ,lock,star 3)Accept customization Specifications ... Dacromet 8) Mechanical Galvanizing 9) Hot-dip Galvanizing5 Type 1) Spring washers 2) Flat washers(plain washer ... non-standard parts, samples or drawings are avaliable for us.4) Working Process Include: cold punching, machining, ... etc.Other special washers please send us your requirments or samples.