These bearings are an extended inner-ring type with a self-locking collar.
Due to the positive contact, the land-riding R-seal provides improved protection against harmful contaminants and retains lubricant under severe operating conditions.
RA-RR series are factory-prelubricated and have cylindrical outside diameters.
RA-RRB series have spherical outside diameters for use in housings with corresponding spherical inside surfaces to provide unrestricted initial alignment.