Ball bearing units consist of an insert bearing mounted in a housing. An insert bearing is a deep groove ball bearing with a sphered (convex) outside surface and an extended inner ring that includes a mechanism to lock the unit onto the shaft. The housings have a correspondingly sphered but concave bore.
Unit bearings also last longer than the typical adjustable bearing service interval. Most should make it past 100k miles before needing replacement. Series 2 and Series 3 in cast iron and cast steel available.
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