I use a deep groove ball bearing now, model is GB/T 276-1994, a large diameter 90, 50 paths, 20 thickness, requirements of bearing outer ring arranged on a bearing seat fit, the inner ring is mounted on a rotating shaft, and the fit, I don't know how to choose the tolerance than the more appropriate. The outer ring with which to choose tolerance, inner and choose? Please expert pointing
Bearings are generally bearings and holes transition or gap, the use of special use of interference, if the choice of interference, the bearing holes selected N7, P7, axis selected N6, P6, hole tolerance increased level. Upstairs K7 is a transition fit, but also can choose, in general, if the requirements are not high accuracy, you can use the bearings and holes transition coordination.
In fact, the bearings are not strictly matched, if required, a little interference fit, 0.1 surplus can be
Select the K7 axis and select P7
