Schraubzwinge

Schraubzwinge, known in English as a screw clamp, is a hand tool used to hold workpieces together by applying pressure with a threaded spindle. It consists of a rigid frame, two jaws, and a lead screw that moves the movable jaw toward or away from the fixed jaw when the handle is turned. The screw mechanism provides adjustable clamping force and precise control, allowing secure fits for gluing, assembly, or machining.

Construction typically features a metal frame made of steel or cast iron, with a movable jaw threaded to receive the screw. Turning the handle advances the screw, which presses the movable jaw against the workpiece against the fixed jaw. This type of clamp can come in various form factors, including compact C-clamps and longer bar or F-clamps that accommodate wider or thicker pieces. Some versions use wooden jaws or protective pads to prevent surface marring.

Sizes range from a few centimeters for small tasks to large clamps with several tens of centimeters of opening. The choice depends on the size of the workpiece and the required clamping force. Schraubzwingen are commonly used in woodworking and metalworking, for activities such as glue-ups, holding parts during drilling or sawing, and temporarily securing components for assembly or welding.

Maintenance involves keeping threads clean and free of debris, applying light lubrication to prevent rust, and avoiding over-tightening to prevent damage to the workpiece or clamp. Proper storage in a dry environment extends the tool’s life.

See also: clamps, bar clamp, C-clamp, vise.