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The Strong Hand Tools CPA120 pipe alignment clamp holds two pipe ends in line so you can tack them before welding. Per the maker and the Amazon listing, it fits pipe from 4.5 to 12 inches in diameter, uses two wide grip plates and a quick-acting screw, and weighs in the high teens of pounds. It is worth considering for shop and field pipe fit-up, but not for pipe outside that diameter range.
Quick specs at a glance
| Item | Detail |
|---|---|
| Product | Strong Hand Tools CPA120 pipe alignment clamp |
| Pipe diameter | 4.5 in to 12 in, per Strong Hand Tools |
| Mechanism | Quick-acting screw and wide grip plates |
| Construction | Steel frame with a powder-coated finish, per the listing |
| Weight | Roughly 17 to 18 lb depending on source; check the listing |
| Use | Aligning pipe-to-pipe, pipe-to-fitting and flange joints for tacking |
Capacity is confirmed by the manufacturer. The listing gives no clamping-force rating, so treat it as a fit-up aid, not a lifting or load-bearing device.
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What it is and who it suits
A pipe alignment clamp pulls two pipe ends into the same plane and holds them there while you tack. Without one, you chase misalignment (high-low) with hammer taps and shims, which is slow and inaccurate.
The CPA120 covers common mid-size pipe from 4.5 to 12 inches. That makes it useful for fabrication shops, plumbers and pipe welders working on process or structural pipe, and for serious DIY builders working on larger pipe.
If you mostly weld small tubing, a lighter or smaller clamp may be a better value.
How to check it fits your pipe
- Outer diameter: measure the actual pipe OD. Make sure both pipe ends fall within 4.5 to 12 inches.
- Wall and fittings: check the grip plates seat flat on elbows and flanges, not only straight pipe.
- Weld access: position the clamp so it does not block the root pass. Move it as you tack.
- Weight: at over 17 lb it is a shop tool, so plan how you will handle it.
- Fit-up gap: the clamp aligns but does not set the root gap; use spacers or your WPS gap.
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Pros and limitations
Pros
- Good diameter range for common pipe sizes.
- Quick-acting mechanism speeds up setup.
- Wide plates help distribute clamping force.
- Removes after tacking, ready for the next joint.
Limitations
- Heavy and bulky for a small home shop.
- Does not cover small tubing or very large pipe.
- Spatter can foul the threaded screw if you weld close.
- Does not replace proper fit-up, bevels and cleaning.
Using it for pipe fit-up
- Clean and bevel the pipe ends and grind the first inch or so back to bright metal.
- Slide the clamp across the joint with grip plates against both pipes.
- Close the quick-acting screw until pipes are held square and level, and check high-low with a straightedge.
- Tack at several points around the joint and remove the clamp before the final welds.
Wipe or cover the screw to protect it from spatter, and wear gloves because the plates stay hot. Support heavy pipe so its weight does not rest on the clamp.
Alternatives and related guides
- welding table clamps: hold parts to a fixture table
- B and B stepped pipe wedge: another way to align pipe joints
- V-type magnetic welding clamps: for angled and small tubes
- welding anti-spatter compound: keeps screws and plates cleaner
Frequently Asked Questions
What diameter pipe does the CPA120 fit?
Strong Hand Tools lists 4.5 to 12 inches. That is the outside diameter range. Measure your pipe to make sure both ends fit, since a clamp that is too large or small will not grip the plates evenly.
Does a pipe alignment clamp set the root gap?
No. It brings the two pipes into line and reduces high-low misalignment, but you still set the gap with spacers or tack points according to your procedure. Check the gap before final tacking.
Can I weld with the clamp in place?
You can tack with it in place, but remove it before the final welds, since it can get in the way of the root pass and takes spatter. Relocate it as you go and clean the screw afterward.
Is it too heavy for portable work?
It weighs a little over 17 lb according to the manufacturer, which is manageable in a shop or truck but not light. For field work, plan how you will carry and store it, and consider smaller clamps for small pipe.
Final verdict
The CPA120 is a solid fit-up tool for pipe between 4.5 and 12 inches, saving time on alignment before tacking. It is heavy and size-limited, so check your pipe diameters. Prices change, so check the current listing.
Check the current price on Amazon →
