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TORRINGTON FAFNIR9121K轴承NTN6916N轴承NACHI6913N轴承NTN6310LB轴承NTN7226CDT轴承NTN7220DT轴承NTN7219BDT轴承NACHI51118轴承FAG53206X+U206轴承INA81168轴承NSKNNU 4921轴承FAG54220+U220轴承SKF6052M轴承NSK6306N轴承NSKF 693 ZZ轴承