Sumner’s Rotary Internal Ground Clamp prevents ground wire tangles for welding applications that are rotating pipe by keeping the ground wire stationary as the pipe rotates. The clamps have three mandrels providing contact to the internal dimensions of a pipe and come in 4” to 8” and 8” to 16” sizes. Clamps attach and detach with an easily adjustable tension spring and mandrel adjustment handle. Clamps utilize the reliable “C” rotary ground, which incorporates both a stationary and movable contact plate that rotates 360°.

Sumner Manufacturing.