1.Material:42CrMo 2.Hardess:HRC52 3.Screw and 30inclintion molding processing,the thread tolerance class 17H-class 1.Material:42CrMo2.Hardess:HRC52°3.Screw and 30°inclintion molding processing,the thread tolerance class 4H-class 4.Accuracy:AA garde 0.005mm5. default balancing : G6.3 12000rpm,18000rpm ER50UM six slot nut