Boss movement during assembly

*The image of the RE-SS series, which can be selected with or without a flange (retaining ring), is provided for reference.

In the series with flanges, when tightening the tightening bolts, the flange acts as a stopper to stop the boss from moving forward together with the outer ring.
The outer ring slides on the inner surface of the boss.

However, in a straight installation without a flange (upper right diagram), there is no stopper, so when the bolt is tightened, the boss moves forward along with the outer ring.
(However, since there is no loss due to sliding, the transmitted torque is higher.)

If you are concerned about the boss moving, choose a type that does not have a moving boss.