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Spring-Fin P-Clamp For 18-24 mm Pipe
A one-piece P-clamp with a 29 mm split ring lined with five flexible spring fins. It grips 1/2 in EMT (17.9 mm), 1/2 in PVC (21.3 mm) or 3/4 in EMT (23.4 mm) without rattling, so you don't have to buy a box of 25 fixed-size clamps to get one odd size. Two 5.5 mm screw holes, 54 mm apart, take #8/#10 wood screws or M5 bolts into a stud or frame rail. Tightening the screw through the 14 mm wide strap closes the 4 mm tab gap and squeezes the ring onto the pipe. Thread the clamp onto the run before you fix it.
Squeeze-Fit Two-Hole Pipe Strap
This two-hole wall strap is sized to one exact pipe. The default is 3/4 in EMT (23.4 mm OD). You can change PIPE_OD to 17.9 for 1/2 in EMT, 21.3 for 1/2 in PVC, 26.7 for 3/4 in PVC or 33.4 for 1 in PVC, so the strap always matches the pipe even when the store doesn't stock that size. The flanges stand 1 mm off the wall, so two #8 wood screws in 4.5 mm holes draw the 3.5 mm arch down and clamp the pipe tight. The part is 16 mm wide and prints flat on its side, which keeps the clamping load in the layer plane.