Double Jackscrew Chain Clamp
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.
Pipe with wall thicknesses up to schedule 80 can be aligned with the Double Jackscrew chain clamp.
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.
- 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″ (0.4mm).
- Heavy Duty – Aligns pipe with wall thickness up to schedule 80.
- Strong – Reforms pipe with wall thickness up to schedule 40.
- Wide Range – Support, align, and reform, 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.
| Part No | No of Jackbars | Pipe Size Range | Reforms to Schedule* | Aligns to Schedule | Estimated Shipping Weight |
|---|---|---|---|---|---|
| D249 | 7 | 4" - 20" | 40 | 80 | 27 lb (12 kg) |
| D249SS | 7 | 4" - 20" | 40 | 80 | 27 lb (12 kg) |
| D235 | 8 | 10" - 36" | 40 | 80 | 72 lb (33 kg) |
| D235SS | 8 | 10" - 36" | 40 | 80 | 72 lb (33 kg) |
| D236 | 13 | 10" - 54" | 40 | 80 | 144 lb (67 kg) |
| D236SS | 13 | 10" - 54" | 40 | 80 | 144 lb (67 kg) |
| D237 | 20 | 10" - 72" | 40 | 80 | 180 lb (72 kg) |
| D237SS | 20 | 10" - 72" | 40 | 80 | 180 lb (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.
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