Abstract: An elongated tension bar intended to be used with the well-known chain link type fence wherein pipelike frame structure and tension bands are provided for cooperating with the instant tension bar to maintain tension on the fence fabric. The transverse cross section of the tension bar is such that regardless of how carelessly the bar is first placed in the end loops of the fabric, the strain or tension subsequently applied thereto causes it to automatically slide into the interior curved or contoured shape of the wire fabric so that it seats snugly into an optimum orientation thus enabling it to perform its task perfectly, i.e., since the bar is immobilized in its optimum orientation, it cannot twist or shift to an undesirable position which normally results in curved or broken bars and loose fabric.