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Original Single Jackscrew Chain Clamp


The Mathey Dearman Single Jackscrew Chain Clamp is capable of reforming up to schedule 40 pipe, on the mating side only.
The individual Jackscrews exert pressure exactly where it is needed to eliminate Hi-Lo on pipe and fittings.

The Level and Support device included allows for the safe handling  of fittings during the welding process.
Alignment of the mating pipe can be made to within 1/64th of an inch, and is available in Carbon, or Stainless Steel models from 1″ to 54″ o/d.

Single Jackscrew Chain Clamp Includes:

  • Length of chain required for the pipe range
  • Single jackscrew jackbars listed for pipe range
  • Main block
  • Fine adjustment
  • Level and support device
  • Jackscrew wrench
  • Carbon or stainless steel spacing screws (optional)
  • Storage box
  • Parts and operating manual

OPTIONAL:

  • Carbon or stainless steel spacing screws
  • Add-on Jackbar

Orig Single Jackscrew Chain Clamp

Specifications
Model Jackbar Qty
Pipe Size Range Inches
Reforms Schedule
Aligns Schedule Weight Kgs 
 D231 3 1-8 40 80 10
 D231SS 3 1-8 40 80 10
 D232 7 4-16 40 80 30
 D232SS 7 4-16 40 80 30
 D233 9 10-36 40 80 77
 D233SS 9 10-36 40 80 77
 D234 13 10-54 40 80 72
 D234SS 13 10-54 40 80 72

SS- Indicates the clamp is Stainless Steel
Calculations are based on pipe with a yield strength of 45,000 lbs./Sq. in./ 3168kg/sq cm.

The Single Jackscrew Chain Clamp reforms the mating side of the weld gap only, and is capable of reforming up to Schedule 40 pipe.
The jackscrews of the jackbar exert pressure on the high points of the mating pipe eliminating “Hi-Lo” as pipe and fittings are aligned.
Pipe wall thickness to Schedule 80 can be aligned with the Single Jackscrew Chain Clamp.

The level and support device of the chain clamp allows the pipe, elbow, tee, flange and other fittings to be held safely and securely in place during the alignment and welding process.
For stainless steel or specialty alloy applications, replace the chain of the standard chain clamp with stainless steel chain.

Available in carbon steel and stainless steel models to fit pipe from 1″ to 54″ (25mm to 1372mm).

NOTE: Complete welding of the pipe and fittings can be accomplished without removal of the clamp. Add-on jackbar can be added if pressure needs to be applied between the clamp jackbars. Jackscrew pads independently pivot to handle uneven surfaces. Spacing screws can be added for precise weld gap adjustment.

FEATURES:

  • ACCURATE—The single screw jackbars, spaced around the circumference of the pipe, provide precise alignment of the inside or outside diameter of the mating pipe to the main pipe within 1/64 of an inch.
  • PRECISELY ALIGNS pipe wall thickness to Schedule 80.
  • EFFORTLESSLY REFORMS mating pipe wall thickness to Schedule 40 pipe.
  • SAFE—Elbows, tees, flanges and other fittings can be supported with the level and support device, reducing the risk of back injury.
  • VERSATILE—The clamp will align and reform pipe, elbows, tees and other fittings.

SPECIAL BENEFITS:

  • One chain clamp covers the range of eight (8) cage clamps.
  • Pipe and other fittings can be fully welded without removal of the clamp.
  • The jackscrew pads independently pivot to handle uneven surfaces.
  • An add-on jackbar can be added if pressure needs to be applied between the clamp jackbars.
  • Spacing screws can be added for precise weld gap adjustment.

Click here for formulas to calculate chain lengths.

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