An SKF H300 series adaptor assembly designed to mount conical-bore bearings on shafts for mechanical engineering use. It has a 1:12 taper for mounting without additional shaft locking. Dimensions measure 90 mm inside diameter, 130 mm outside diameter and 71 mm width, with an M100 × 2.0 thread and a 20 mm nut adjustment distance. Supplied as a set containing a split-section sleeve, a KM self-locking nut and an MB circlip.