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• The most common type of clamp—consists of a C-shaped frame, made of either forged steel or cast iron, into which an adjustable screw is assembled to change the jaw opening.
• The size of a C-clamp is measured by its jaw capacity—the dimension of the largest object the frame can accommodate with the screw fully extended. Most range in jaw capacity from 2” to 10”.
• Also important is depth of throat, the distance from the center line of the screw to the inside edge of the frame. C-clamps range from 3/4" to 14".
• Most have a sliding cross-pin handle or a wing nut that is used to tighten the screw.