... Certification:ISO9001:2008, ISO14001:2004 SGS Specifications Square head galvanized boltsProcess Capablilities Standard ISO, GB, DIN, JIS ... M12 Material Stainless, Steel,Brass, Steel,Bronze, Iron,Aluminum,Carbon steel,Alloy steel, silicon bronze,etc. Head/Tread styles According ... mainly produces forged fastener precise screws, which are made of titanium, copper, aluminum, iron, stainless steel and so ...