... head ,Hex flange head ,Torx head ,Button head ,Cup head ,Flange head5.Surface Treatment: Polishing, Anodizing, Black oxide 6.Material: Titanium alloy and pure titanium7 ... at home and abroad and development together. TermTitanium scew and titanium boltGradeGr1,Gr2,Gr3,Gr4,Gr5,Gr7,Gr9,Gr11,Gr12,SizeBolt ...