Climax Metal C-100 Shaft Collar, Zinc Plated Steel, Set Screw Style, One Piece, 1 Bore, 1-1/2 OD, 5/8 Wide, With 5/16-18 Set Screw

Been using this for home gym barbells (10-15lb weight per side) as a more stable substitute for the elastic bands I previously used and have had no issues. The diameter was exactly as described and the collars have held with no loosening after a few dozen weightlifting sessions. Granted I keep the barbell level to the ground pretty much the majority of the time, the collars have not shifted any noticable amount after a fair amount of pressure on them over the past few weeks.

Not sure about this one

Inside diameter was too small to fit 1 steel tubing.

Set screw is NOT 5/16-18, its 5/16-24... at least the one they sent me. Probably doesnt matter to many, but I planned to replace the set screw with a threaded knob, so my project is now delayed while I either find a replacement or tap a new hole in this one.

This items rusts very quickly. Other than that, its a nice piece that works well.

Use them to keep the wheels close together on the sides from my hand card

Perfect for project

I have been using these in place of spring clips for a 1” barbell. I find them much easier to use with an extra Allen wrench on hand than the spring clips, and they remain very secure even at weights over 100 lbs.

Used for a shop made spinning drum to drag the lawn and make it level.

I got a few to fit around a standard 1 dumbbell bar as weight collars. It fits perfectly on all the standard bars I have and tightens down tight and secure. I dont worry about scratching my dumbell bars but if I did theres other style shaft collars that screw around to tighten like pipe clamps.