滚针轴承内径50外径80宽度45型号NAX80X30NAX80X45NAVX80X30RNAX80X45NA6911A55X80X45滚针轴承needlebearing是带圆柱滚子的滚子轴承，相对其直径，滚子既细又长这种滚子称为。三轴承的内径不是5的倍数或者大于等于500mm，内径代号用斜杠‘’隔开另...