Positive lock for bearing subassembly and adjusting nut kit

The present invention relates generally to a shaft mounting assembly. More particularly, the invention relates to a multi-piece bearing subassembly securable as a single unit to a shaft within a shaft mounting assembly. A bearing subassembly includes an improved arrangement for securing the bearing subassembly to a shaft. An adjusting nut is axially locked to a bearing inner ring by sliding the adjusting nut over the inner ring so that a groove in the adjusting nut and recesses, for example, pockets, on the inner ring align. Securement elements, for example, balls, are inserted into the groove and seated in the recesses through a bore from the outer diameter of the adjusting nut to the groove. The inner ring is rotated to allow the securement elements to fall into the recesses and are enclosed between the groove and recesses by inserting, for example, a set screw after the securement elements are loaded. The securement arrangement then prevents the bearing subassembly adjusting nut and inner ring from separating.