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Clamp (tool) For other uses, see Clamp. A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
Adjusting the screw closes the jaw and applies pressure. C-clamps are used to hold to objects flush together. F-Clamp. Also known as a bar clamp, the F-clamp has one fixed jaw at the end of a bar and another jaw that slides along the bar to adjust capacity and pressure. F-clamps are made for larger objects, with bars measuring up to several feet in length.