... washers OEM from China; Certification:ISO14001 ISO9001 SGS Specifications Colored metal flat washersProcess Capablilities Standard ISO, GB, DIN, ... ,Titanium, Cadmium, Dacromet,Heat dip zinc, Chromate , Electro Painting etc. Certificate SGS, ISO9001:2008, ISO14001:2004 Carton size ... manufacturer of screws with well-equipped testing equipment and strong technical force. With a wide range, good quality, ...