Double Jackscrew Chain Clamp

Double Jackscrew Chain ClampMathey Dearman’s Double Jackscrew Chain Clamp reforms Schedule 40 pipe on either side of the joint to be welded. It is also able to exert pressure on the high points of both sides to eliminate “Hi-Lo.” The Chain Clamp’s Level and Support Device allows the pipe, elbow, tee, flange and other fittings to be held securely in place during alignment and welding. Pipe with wall thicknesses up to Schedule 80 can be aligned with the Double Jackscrew Chain Clamp. Mathey Dearman Double Jackscrew Chain Clamps are available in carbon steel chain and stainless steel chain versions to fit pipe from 1” to 54” (25 mm to 1372 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.

FEATURES:

  • EXTRA WELDING CLEARANCE | Jackbar design provides additional clearance, so the weld can be easily completed with clamp in place
  • PRECISE ALIGNMENT | Double Jackbars, spaced around the diameter of the pipe allow reforming on both sides of joint to within 1/64" (.4mm)
  • 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

BENEFITS:

  • One Chain Clamp covers the range of 8 cage clamps
  • Pipe and fittings can be fully welded with clamp in place
  • Jackscrew contact points swivel to protect against marring the pipe
  • Optional Spacing Screws available to assist in setting weld gap
  • An add-on Jackbar can be added when additional reforming pressure is need.

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
  • Level and Support Device
  • Jackscrew Wrench
  • Heavy-duty Storage Box
  • Parts and Operating Manual

Specifications

Model Number of Jackbars Nominal Pipe Size Range in (mm) Reforms Pipe to Schedule* Aligns Pipe to Schedule Est. Shipping Weight
D250
3
1-8 (25-203) 40 80 27 lbs / 12 kg
D250SS
3
1-8 (25-203) 40 80 27 lbs / 12 kg
D249 7 4-16 (102-406) 40 80 72 lbs / 33 kg
D249SS 7 4-16 (102-406) 40 80 72 lbs / 33 kg
D235 8 10-36 (254-914) 40 80 144 lbs / 67 kg
D235SS 8 10-36 (254-914) 40 80 144 lbs / 67 kg
D236 13 10-54 (254-1372) 40 80 180 lbs / 72 kg
D236SS 13 10-54 (254-1372) 40 80 180 lbs / 72 kg

*Calculations are based on pipe with a tensile strength of 45,000 lbs per square inch / 3,164 kg per square centimeter

SS - Indicates clamp includes stainless steel chain. All clamps equipped with stainless steel Jackbars, Jackscrews, and Main Blocks.

NOTE: MATHEY DEARMAN CHAIN CLAMPS CAN BE RECONFIGURED FOR STAINLESS STEEL AND OTHER SPECIALTY ALLOY APPLICATIONS. REPLACE THE CARBON STEEL ROLLER CHAIN WITH STAINLESS STEEL CHAIN. (ALL OTHER COMPONENTS OF CHAIN CLAMPS ARE MADE OF STAINLESS STEEL)

THE DOUBLE JACKSCREW CHAIN CLAMP SHOULD NEVER BE USED AS THE SOLE SUPPORT FOR THE PIPE OR TO LIFT THE PIPE. DO NOT EXCEED PIPE SIZE RANGE LISTED OR USE ANY TYPE OF CHAIN OTHER THAN SUPPLIED WITHOUT FIRST CONTACTING THE MATHEY DEARMAN SALES DEPARTMENT. USE OF CHAIN NOT SUPPLIED WITH THE CLAMP BY MATHEY DEARMAN WILL VOID THE CLAMP WARRANTY.