... 8/10.9 UNC/UNF thread Material:45#/1045,40Cr/5140,Q235/A283GRC good quality,cheap price sample available ... hardness test,roughness test,tensile test Equipment CNC machine,automatic machine,thread rolling machine,tapping drilling machineSurface treatment Black ... 10years processing experience ,we devote ourselves to provide good quality products with reasonable price ,our products are widely ...