4T-30304 日本NTN精密主轴轴承 6815ZZ/5K,4T-30304重量,4T-30304尺寸,4T-30304参数 NK10/12T2+1R7X10X12图纸,NK10/12T2+1R7X10X12 采购价格NK10/12T2+1R7X10X12,NK10/12T2+1R7X10X12货期, ...