... China; Certification:ISO14001:2004 ISO9001:2001 SGS Specifications Truss head hex socket machine screw Xiamen Haixingcheng Metal Products Co., Ltd. is a ... , 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 etc.SizeM0.8~M12MaterialStainless, Steel,Brass, Steel ... ,Bronze, Iron,Aluminum,Carbon steel,Alloy steel, silicon bronze,etc.Head/Tread stylesAccording client's requiresCoating/Surface treatmentZinc,Tin,Sn/Pb ...