A railing support post with threaded holes or receivers for receiving threaded hardware, such as might be used for tensioned cable railing. A decorative sleeve or post cover may be used to at least partially enclose the railing support post. The railing support post may be manufactured, for example, by providing an elongated member of a prescribed length, drilling a plurality of holes spaced along the length of the elongated member, and tapping the plurality of holes to form a plurality of threaded receivers. The threaded receivers are configured to receive rail fittings or other fittings.