Grade:4.8/5.8/6.8/8.8/10.9 Customized specification UNC/UNF thread Material:45#/1045,40Cr/5140,Q235/A283GRC Hot forged MaterialMid/low carbon steel/alloy steelSizeCustomized,mainly produce size M20-60Grade4.8/5.6/5.8/6.8/8.8/10.9 Thread UNC/UNF. Testing hardness test,roughness test,tensile test Equipment CNC machine,automatic machine,thread rolling machine,tapping drilling machineSurface ...