Renold REUSNU series Trapped Roller Freewheels are non self-centring. Bearing must be placed adjacent to the freewheel to ensure concentricity between inner and outer races.
Torque is transmitted to the inner race via a key and the outer race by meanse of either face keys or interference fit. The freewheel must be lubricated prior to use. Oil lubrication is essential for over running applications. This is an open design so sealing must be provided by the installation.