... Certification:ISO14001:2004 ISO9001:2001 SGS Specifications Truss head hex socket machine screw Xiamen Haixingcheng Metal Products Co., Ltd. is ... Aluminum,Carbon steel,Alloy steel, silicon bronze,etc.Head/Tread stylesAccording client's requiresCoating/Surface treatmentZinc,Tin, ... /Pb,Nickel,Chrome,Titanium, Cadmium, Dacromet,Heat dip zinc, Chromate , Electro Painting etc.Certificate SGS, ISO9001:2008 ...