The bar clamp, which comes in pipe, parallel jaw, aluminum bar, and steel bar versions, is used in almost every facet of cabinetmaking, and the right clamp can make the difference between success and failure. So I tested the 48-in. size of a representative sample of clamps to measure the deflection in both the bar and the jaws when applying various levels of force. I also used a set of four of each type of clamp to assemble a simple MDF carcase (joined with biscuits) and a large poplar panel, looking at ease of use and the resulting flatness and squareness of the finished product. Manufactured by WMH and sold under the Wilton name, this is a close copy of the Jorgensen pipe clamp, but its fit and finish were not at the same level, and it didn’t operate smoothly. As with the Jorgensen, the clearance between the screw handle and the workbench can be an issue.

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