S45,40Cr material or better material used on construction machinery,Size: M12-M33,Hardness: HRC26-36 We ... high tensile forged fasteners and auto parts with S40Cr material or better material used on construction machinery & auto.also we supply all kinds ... -36Plating: Hexavilent Plating (Zinc Plating, Rainbow)With 45C,S40Cr material or better material,bolts for 10.9/12.9class,tensile strength 170 ...