Non-self-centering freewheels are models used as intermittent advance , anti - return and overspeed that require a laterally mounted bearing for correct centering between the inner ring and the outer ring. Since they do not have a bearing, they must be mounted without the presence of axial and radial loads acting on them as they could damage the internal parts of the wheel.

 

• The US (sizes 8-60) are not centering roller freewheels that can be lubricated with either oil or grease and have the same dimensions as the 62 series bearings.

• The USNU (sizes 8-100) are not self-centering roller freewheels that can be lubricated with either oil or grease and have the same dimensions as the 63 series bearings.

• The UF (sizes 8-150) are not self-centering roller freewheels that can be lubricated with either oil or grease. They are the non-self-centering equivalent of the GF wheels in terms of transmitted torque and dimensions.