8-foot clamps for $8
Pipe clamps are a staple in hobbyist and pro shops around the world. That’s because they are cheap, strong, and versatile. Buy longer pipes and there is almost no limit on how far you can extend them. But no one wants to wrestle with 8-foot pipes on the typical 3-foot cabinet or tabletop glue-up.
The answer is the humble pipe coupling. Black iron pipe comes with two threaded ends, so just buy shorter lengths, say 4 feet, and add a pipe coupling whenever you need to double the reach. At less than $2 a pop, you can make yourself a set of four 8-foot clamps for under 10 bucks. Thread each end in at least 3/8 in., and the assembly will be as stable as a solid pipe.
You can get couplings for both 1/2- and 3/4-in. pipe but my recommendation is to avoid 1/2-in. pipe clamps. They flex too much under pressure.
The humble pipe coupling lets you extend your pipe clamps 10 feet or more.
Big glue-ups are no problem with this simple accessory.
Pipe couplings extend the reach of both 1/2- and 3/4-in. pipe almost indefinitely.
Just make sure both ends of the pipe are threaded, not cut off, so you can screw on the clamp fixture as well as the coupling.