三排滚柱式回转支承有三个座圈，上下及径向滚道路各自分开，使得每一排滚柱的负载都能确切地加以确定。能够同时承受各种载荷，是四种产品中承载能力最大的一种，轴、径向尺寸都较大，结构牢固，特别适用于要求较大直径的重型机械，如斗轮式挖掘机、轮式起重机、船用起重机、港口起重机，钢水运转台及大吨位汽车起重机等机械上。

The three-row roller slewing bearing has three seat-rings,which separate the upper,lower and radial races,via which the load of each row of the rollers may be specified.It may bear different loads simultaneously and its load capacity is the largest one among the four models.
Thanks to the large size of its axle and radius,it is sturdy and especially suitable for heavy-duty machines which require large working radius.such as bucket-wheel excavators,wheeled cranes,ship cranes,ladle turrets,heavyduty mobile cranes etc.