... experience in special fastener field 1,Name: Black thread bolt;Thread bolt;Black bolt 2,For the similar bolt,what ... ,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr.36,Gr.58,1010,1015,1016,1020,1045,etcAlloy ... Rohs &6+ ) plated,anodic oxidation,etc Dip plating black oxide coating,hot dip galvanizing,etc Flame plating Light oil ... hardware fastener ,especially the cutting/turning parts. Black thread bolt