How to choose the fit of deep groove ball bearing?

According to the rotation of the load acting on the deep groove ball bearing relative to the ring, there are three kinds of loads on the bearing ring: local load, cyclic load and swing load.
Generally, the cyclic load (rotating load) and swing load adopt tight fit; In addition to the special requirements for local load, it is generally not suitable to use tight fit.
When the bearing ring is under the sustained load and heavy load, the inner ring and outer ring should adopt interference fit, but sometimes the outer ring can be slightly loose, and it should be able to move axially in the bearing housing hole;
When the bearing ring bears the swing load and the load is light, a slightly loose fit can be used. If the axis rotates, K6 and K7 are generally selected; H7 and H8 are used for hole selection. If the seat of the hole rotates, H6 and H7 are generally selected as the axis; K7 and K8 are used for hole selection