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

These things are the best standard barbell collars that I have ever come across. They keep the weight extremely tight to the bar. The only issue is that there is a great deal of variation in the the diameter of standard barbells…so check first before ordering.

Item arrived on time and worked great.

Listed as 5/16 - 18 thread pitch but was actually 5/16 - 24. Rather than that they are the correct diameter and well made

I purchased one 1 inch ID (inside diameter) as a reference sample for future Purchases. Its lite weight. Brushed aluminum clean finish. set screw is iodized black finish. Smooth operation. Included are two Allen wrench/Allen key. I recommend this product.

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.

Inside diameter was too small to fit 1 steel tubing.

using to be a stop point for a tool rest on my lathe. plenty of space but no slop. not a machinist fit but not that it is needed for the application.

Good fit

Great pieces. Very happy.

It is a good shaft lock