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![](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.homemadetools.net%2Fforum%2Fshowthread.php%3Fp%3D161089%23post161089&media=https%3A%2F%2Fs3.amazonaws.com%2Fhmt-newsletter%2Fhmt_avatar_200.jpg&description=Adjustable Height Table Legs by dgbreggin - The main brand of these telescoping perforated tubes is Telespar, made by Unistrut.
They make two fasteners for the Telespar product that could be beneficial to applications like this.
One is called the "Corner Bolt=". It is a specially designed bolt that goes through one of the holes and comes out through a hole in the adjascent side (not the opposite side). You can put a nut on it and fasten it with a single wrench since the bolt cann= "Pin It")
The main brand of these telescoping perforated tubes is Telespar, made by Unistrut.
They make two fasteners for the Telespar product that could be beneficial to applications like this.
One is called the "Corner Bolt". It is a specially designed bolt that goes through one of the holes and comes out through a hole in the adjascent side (not the opposite side). You can put a nut on it and fasten it with a single wrench since the bolt cannot turn. When tightened, it clamps the two tubes to each other very rigidly.
https://www.unistrutohio.com/tl070-e...-square-tubing
They also make a product called "Lock Pins". These pins slide into holes on opposite sides of the tube, and then swing down (by gravity) to a position that prevents the pin from slipping out. It is very fast and very secure, though it does not clamp the two tubes together.
Best picture I could find is here, along with the corner bolts...
https://www.unistrutohio.com/wp-cont...oad-tables.pdf
This page also shows a variety of brackets and fittings to assemble these tubes into racks and stands and signs and what-not.
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