A chain link fence system has end, corner, or gate posts, each comprising a tubular metal post with a series of spaced, vertically-aligned openings along at least one side thereof. A supporting cross bar extends from one post to another and has a horizontally-positioned, apertured tonguemember at each end positioned in the top side opening of the post with the apertures oriented vertically. The end links of a chain link fence are positioned in the vertically aligned openings and a retaining rod inserted downwardly through the aperture in the tongue member and through the end links of chain link fence to secure the cross bar and the chain link fence wire to the post. A cap member covers the top of the post. The chain link fence is preferably secured to intermediate line posts by a novel retaining wire tie of a heavy bendable wire having the initial shape of a shepherd's crook and self closing at the crook end when properly installed. An alternate embodiment has a plurality of retainer members which fit in and are retained by the openings in each post and have openings which receive a retaining rod to secure the ends of a chain link fence thereon.