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 Jet aluminum bar clamp allowed an unacceptable amount of bar flex and deflection in the clamp jaws. After about six tests, the Jet clamp became bent permanently, and the notches for the tail fixture were distorted. Last, I found that occasionally the clamp head would bind on the bar when tightened.

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