The NFR series is a bearing-supported self-contained one-way clutch without any sealing. The clutch's oil lubrication and sealing must be provided by the user. It uses size 8 to 20 units steel on steel bearing support from the inner race which is keyed to the shaft. There are other sizes from 20 to 160 series ball bearing that is used for higher overrunning speed capacity. The devices' outer race has a positive n6 tolerance to give a press fit in a housing to H7 and has an additional side notches to provide positive torque transmission.