NK9/16T2+1R6X9X16 日本NTN高精度轴承 4T-02878/02820,NK9/16T2+1R6X9X16重量,NK9/16T2+1R6X9X16尺寸,NK9/16T2+1R6X9X16参数 4T-14130重量,4T-14130尺寸,4T-14130参数,