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NSK68/500轴承TORRINGTON FAFNIR218K轴承DKF7234B·WF轴承SNR7218HDT轴承KOYO5309ZZ轴承RHPQJ322轴承SKFBK 1412轴承SKF53317+U317轴承SKFNU 240轴承STEYRNU 218 E轴承NTNN 224轴承FAG51132FP 轴承SKF6411轴承SKFQJ 308 N2MA 轴承NSKNU 1020轴承