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1-5/8 in Strut Channel Crush-Rib End Cap
Press-fit end cap for 1-5/8 x 1-5/8 in strut channel (Unistrut P1000 style, 41.3 mm square, 12 ga wall, about 35.9 mm inside width) that covers the sharp burred end of a cut length so it stops catching shins and knuckles. A 44 x 44 x 3 mm flange hides the cut edge; the hollow 35.4 x 10 mm plug sits against the channel back, below the lips, and six vertical crush ribs bring it to 36.6 mm so it bites into the steel with no screws. A 5.5 mm M5 clearance hole in the flange centre takes a bolt, eye or cord.
Strut Channel Quarter-Turn M5 Nut Carrier
This is a twist-lock channel nut for 1-5/8 in (41.3 mm) strut channel such as Unistrut. It is a 34 x 20 x 10 mm carrier with a pocket for a captive M5 hex nut (8 mm across flats) and a 5.5 mm bolt hole. It drops lengthwise through the 7/8 in (22 mm) slot and turns clockwise 90° on two rounded leading corners. It stops against two square corners, with each end sitting about 6 mm under the lips in 2 mm deep grooves (4 mm wide, centred 12.5 mm from the middle). You can bolt pipe saddles, brackets and test-rig parts to strut channel without buying metal spring nuts.