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. The Irwin’s head assembly attaches to the pipe by means of a clutch mechanism, as opposed to screwing onto the end of the pipe. While this allows the use of unthreaded pipe, the entire head fixture spun when I tightened the screw. Also, the plated screws didn’t operate freely, likely contributing to the spinning head.

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