The B200/B500 Series Clutches share the same design. A full complement of cams is retained in an outer race. This requires a bearing supported hardened shaft as the inner race. These are primarily used for back stopping applications.
The BR Series Clutch has cams that are designed to lift-off. They have no contact with either the inner or outer race when it overruns. This provides extended overrunning wear life.
The HT Series Clutch was designed primarily for indexing applications. These cam clutches are not symmetrical and therefore must be ordered according to the rotation required in application.