NJ2224 日本NTN机床主轴轴承 30311U,NJ2224重量,NJ2224尺寸,NJ2224参数,23236.EMW33图纸,23236.EMW33 采购价格23236.EMW33,23236.EMW33货期 NNU4940C1NAP5型号尺寸，NNU4940C1NAP5轴承价格,NNU4940C1NAP5采购,,