Double Jackscrew Chain Clamp: Pipe Welding Clamp

Mathey Dearman invented the first chain clamp for welding pipe in 1930, and the Double Jackscrew chain clamp was launched in 1931.

The Double Jackscrew chain clamp reforms schedule 40 pipe on either side of the joint to be welded, and it is also able to exert pressure on the high points of both sides to eliminate “Hi-Low”. The chain clamp’s level and support device allows the pipe, elbow, tee, flange and other fittings to be held securely in place during pipe alignment and welding. Level and support device not included, must be purchased separately.

Pipe with wall thicknesses up to schedule 80 can be aligned with the Double Jackscrew chain clamp.

Mathey Dearman's Double Jackscrew chain clamp is available in carbon steel chain and stainless steel chain versions to fit pipe from 1" to 54" / 25 mm to 1,372 mm in diameter.

Although all Mathey Dearman pipe welding chain clamps feature stainless steel jackscrews, jackbars and main blocks, stainless steel chain should be used on stainless steel or specialty alloy applications to avoid potential contamination.