... /6.8/8.8/10.9 UNC/UNF thread Material:45#/1045,40Cr/5140,Q235/A283GRC good ... 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/ ... support OEM service .Drawings and samples are available. thread inserts abrasive special fasteners