Shaft end adapter and ball screw assembly

A shaft end adapter, comprising:

• a mounting shaft portion;
• a tubular portion coaxially formed with one end of the mounting shaft portion and having an axial bottomed bore having a circular cross section and defining an opening for receiving an end of a shaft member at a free end of the tubular portion, the free end being axially remote from the mounting shaft portion, wherein the tubular portion is formed with a large diameter portion in part thereof at or adjacent to the free end thereof, and is formed with an entirely circumferentially continuous portion in a part thereof at or adjacent to the free end thereof, and wherein the tubular portion defines a slit extending axially through a wall of the tubular portion in exclusion of the entirely circumferentially continuous portion;
• and
• a clamp member mounted on the tubular portion and configured to close the slit, wherein the clamp member comprises a fastening bolt threaded into the tubular portion and extending across the slit, wherein the large diameter portion defines a bolt mounting recess in which a bolt receiving hole opens, and wherein the bolt receiving hole is configured such that the fastening bolt is inserted into the bolt receiving hole to be threaded into the tubular portion.