PK22X30X14.7X2 日本NTN精密主轴轴承 81228,PK22X30X14.7X2重量,PK22X30X14.7X2尺寸,PK22X30X14.7X2参数 4T-18790交期价格,4T-18790参数图纸,4T-18790价格,