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 head fixture on the Wetzler has an alignment pin that helps keep the jaw perpendicular. However, the tail jaw tilts forward, like the jaws on the other steel bar clamps. There was little clearance for the Wetzler’s T-handle above a workbench, and the base was not stable. This clamp uses a cam mechanism rather than positive stops.

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