... washers OEM from China; Certification:ISO14001 ISO9001 SGS Specifications Colored metal flat washersProcess Capablilities Standard ISO, GB, DIN, JIS, ANSI, ... /Tread styles According client's requires Coating/Surface treatment Zinc,Tin,Sn/Pb,Nickel,Chrome,Titanium, Cadmium, Dacromet,Heat dip zinc ...