A C-Clamp is a C-shaped fastening device that uses a threaded bolt to apply pressure and hold equipment securely in place, commonly used in film, video, and stage production for attaching lighting or grip equipment to pipes or trusses.
The C-Clamp takes its name from its “C” shape, allowing it to wrap around pipes, scaffolds, or mounting bars. A screw or bolt tightens to create a vise-like grip that holds the clamp firmly in position. Many versions include studs or mounting points for attaching lighting fixtures, rigging components, or other accessories. In audiovisual and stage settings, C-Clamps provide a reliable and adjustable solution for mounting equipment safely overhead, accommodating both temporary setups and long-term installations. Their construction is typically heavier and more precise than general-purpose clamps, supporting the unique demands of entertainment production environments.
While no single organization governs C-Clamps exclusively, load and safety considerations are addressed by agencies such as OSHA (Occupational Safety and Health Administration) in the United States, especially regarding overhead rigging and workplace safety standards.
Originally developed for woodworking and metalworking in the 19th century, the C-Clamp was designed to hold materials securely during fabrication. As stage and film production evolved, its durable and adaptable design made it ideal for rigging lights and audiovisual equipment, leading to specialized models built for the entertainment industry.