Abstract: A fence system tensioning apparatus for tensioning a section of fencing material extending between support fence posts. The tensioner is rotatable with a rotation tool such as a wrench without contacting the outer side walls of a generally cylindrical sleeve member. The sleeve may be rotated 360° about its rotational axis. A fencing material connection member on the sleeve receives and retains fencing material as the sleeve is rotated by turning rotational members and the material tensioned. A lock nut assembly is attached to the sleeve to prevent rotation of the sleeve after the material has been properly tensioned.