Block pull clamps provide very quick and secure fastening and are ideal for 5-axis machining. They consist of a clamp base used with clamping screws. Block pull clamps mount under a workpiece, which allows the surface that will be machined to be accessible to the cutting tool. In addition to tightening with a wrench, this clamp can be operated with nut runner for automation and impact wrench for lower workload. Locating repeatability using Block Pull Clamps alone is ±0.3. The body is made from 1045 steel with a black oxide finish. The contact pad is made from 4140 alloy steel, quenched and tempered, with a black oxide finish. The locating bushing is made from 4135 steel, quenched and tempered, with a black oxide finish.