... years experience in special fastener field 1,Name: Black thread bolt;Thread bolt;Black bolt 2,For the similar bolt,what can ... finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc Dip plating black oxide coating,hot ... industry is machined hardware fastener ,especially the cutting/turning parts. Black thread bolt