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

Mathey Dearman’s Double Jackscrew chain clamp is available in carbon steel chain and stainless steel chain versions to fit pipe from 1 – 54″ / 33.4 – 1,372 mm in diameter.

Although all Mathey Dearman 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.

• Extra Welding Clearance: Jackbar design provides additional clearance, so the weld can be easily completed with the clamp in place
• Precise Alignment: Double jackbars spaced around the diameter of the pipe allow reforming on both sides of the joint to within 1/64″ 0.4 mm
• Heavy Duty: Aligns pipe with wall thickness up to schedule 80
• Strong: Reforms pipe with wall thickness to schedule 40
• Wide Range: Support, align, and reform elbow, tees, and other fittings that cage clamps can’t; one chain clamp covers the range of 8 cage clamps
• Versatile: With the standard level and support device, the clamp can be configured to align, reform, and support almost any type of fitting for welding

Double Jackscrew chain clamp includes:

• Nickel-plated carbon steel or stainless steel duplex roller chain
• Stainless steel double jackscrew jackbars – quantity as indicated in specifications
• Stainless steel main block
• Jackscrew breaker bar with socket
• Heavy-duty storage box
• Parts and operating manual

Accessory – purchase as necessary:

• Level and support device

We have been manufacturing and selling the double jackscrew chain clamp for over 90 years.