Types CNAS and CNFS freewheels are light duty roller ramp clutches manufactured to standard bearing dimensions; CNAS type as 62 series ball bearings and CNFS type as NU 23 roller bearings. The clutches are mainly used for precision indexing and overrunning applications. Torque transmission is via a key on the shaft, and for type CNAS a press fit of outer into housing, and type CNFS via two keys in the end face of the outer race.