批发ER25-UM压帽 高速动平衡螺母 螺帽 ER25-UM NUT M32*1.5螺纹:材质:40CR / 42CRMO硬度:44-52HRC螺纹及30斜度一次成型加工,螺纹公差等级为6H级精度:AA级(0.004)mm螺母已设预动平衡: G6.3 12000RPM、18000RPMMaterial: 40CR / 42CRMOHardness: HRC52Screw and 30indination molding processing,the thread tolerance class 4H-classAccuracy:AA grade (0.004)mmDefault balancing G6.3 12000rpm, 18000rpm