选用无内圈或无外圈，以及无内、外圈滚动轴承时，作为滚道的孔或外壳孔表面的硬度、加工精度和表面质量应与轴承套圈的滚道相仿，以保证负荷能力和运转能与有套圈轴承相同。

• In case that the rolling bearings with no inner ring or outer ring and without inner and outer rings ars selected, the sueface haedness of the holes or housing holes as race, the working accuracy and surface quality shall be similar with the race of bearing rings in order to guarantee that loading capacity and operating performance are identical with the bearings equipped with rings.