Black steel threaded rod Dia:Min 2 mm Surface :Zn SGS audited ... 1,Name: Black steel threaded rod ;Steel threaded rod;Black threaded rod2,For the similar threaded rod ,what can we do ?(1 ... ), Ability for the material of this kind of threaded rod: Grade3.6,4.6,4.8,5.6,6.8 ... plating Light oil,spray coating,electrophoretic coating,etc Polishing Grinding and polishing,etc,except mirror finish(3),Ability for ...