Lee Valley Bessey 4 1/2″ Jaw Heavy-Duty Fast-Acting Clamps

Made in large sizes with incredibly sturdy construction, these heavy-duty clamps can deliver more clamping force than most of us will ever need. On top of that, they offer some improvements on the classic fast-acting bar clamp design.

The steel bar has a profile similar to an I-beam, increasing its rigidity and resistance to twisting forces. The bar is serrated on both edges, with three facets on each side to increase the gripping area for the movable jaw. For complete assurance that the moving jaw won’t slip, you can tighten a set screw to lock it in place on the bar. The synthetic handle won’t loosen in changing humidity and has rubber sections that allow a good grip.

Made with tough malleable cast-iron jaws and an Acme-cut screw, these clamps can apply up to 1540 lb of clamping force. They have a 4 1/2″ jaw depth and a 1 1/4″ face width, with a 7/16″ thick by 1 7/8″ wide bar.