... /5.8/6.8/8.8/10.9 UNC/UNF thread Material:45#/1045,40Cr/5140,Q235/A283GRC good quality,cheap ... /5.6/5.8/6.8/8.8/10.9 Thread UNC/UNF. Testing hardness test,roughness test,tensile test Equipment ... CNC machine,automatic machine,thread rolling machine,tapping drilling machineSurface treatment Black oxideStandardGB/ASTM/DINPackagewooden ...