Top Spring Nut with Coil Spring Jiaxing Zhongren Metal Co., Ltd Base Info Model NO.：JBSN-031Material：Carbon SteelType：SpringConnection：Common BoltHead Style：SquareStandard：DIN, ANSI, GB, BSWGrade：4.8 Description Pre：Black - Grade10.9 - M24 - En 14399 Hr/Hv - Heavy Hexagon Head Bolt/Heavy Hex Bolt - Carbon Steel - 42CrMo/B7 Next：Black - Grade10.9 - M27 - En 14399 Hr/Hv - Heavy Hexagon Head Bolt/Heavy Hex Bolt - Carbon Steel - 42CrMo/B7
