Klemmarm

Klemmarm is the German term for a clamping arm, a mechanical component used to hold or secure a workpiece by applying a force through an arm that bears on the object. It is a common element in fixtures, clamps, and jigs in manufacturing, woodworking, metalworking, and laboratory setups. A klemmarm can be part of a clamp, a fixed or adjustable fixture arm, or integrated into a toggle clamp or gripping device. Actuation methods vary and include manual screw or lever action, cam mechanisms, and powered options such as pneumatic or hydraulic systems. The arm typically carries a contact pad or jaw that presses against the workpiece, sometimes with compliant or replaceable surface inserts to avoid damage.

Materials and finishes vary by application; standard versions are made of carbon steel or stainless steel, with aluminum for lightweight applications. Surfaces may be treated with zinc plating, black oxide, or coatings to resist corrosion. Key design considerations include load capacity and clamping force, reach and alignment, repeatability, surface protection, ease of maintenance, and compatibility with other fixtures.

Applications include securing workpieces for machining, assembly, measurement, or inspection; used in machine tools, positioners, inspection benches, and modular fixturing systems. Advantages include quick, adjustable securing and good repeatability; limitations include potential damage to sensitive parts, wear on contact surfaces, and finite clamping range. See also clamps, workholding, fixturing.