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

It is a good shaft lock

These probably work great for 1 inch precision machined shafts, but they are too small for 1 inch round tube stock from Home Depot or Lowes.

Good fit

Worked as intended. Good machining. I also drilled and tapped some smaller set screws with no issues.

Inexpensive solution to threaded dumbbell handles that will not stay tight.

Filled my needs on my current 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.

Item arrived on time and worked great.

I can’t fault the seller that these collars didn’t fit on all my 1-inch bars. The specs are posted. However, it seems not all 1-inch bars are exactly 1-inch in diameter after all. I used these Climax collars on an old EZ-curl bar with threads/collars worn so badly they no longer tighten down completely. Also, one of the plate stops had come loose over the years. I used one on each side to make the weight-plate placement equal, and another one on each side to keep the screw-collars from backing out — four in all, and saved me the cost of buying an expensive new EZ-curl bar. Although fitting easily on that bar and another older threaded type bar, they were too tight on my newer, threaded dumbbell bars and on my older slide-collar type bars. The original collars for the latter measured about 1.050”. Obviously, these Climax collars weren’t designed for this particular 1-inch application in the first place. They also didn’t fit over the 1-inch round rolled-steel bar stock I’d used on my old homemade cable lat low-row machine built 28 years ago. I measured these bars with precision dial calipers (0.001” accurate) and discovered that they are not perfectly round, hence not precisely 1-inch in diameter. Varying by plus or minus 20 thou, depending on the point of measurement. This also proved to be the case with the older slip-on collar type barbell and dumbbell bars. I decided to try drilling them [collars] out to 1/32” over with an electric drill, my drill press being broken, but the attempt failed. Bad idea! A better one was to use a high-speed rotary grinder and grinding stone. This took a few minutes for each collar but worked well enough and didn’t really cost me anything except a little time. Despite that minor hassle, these are excellent quality collars. I’m now using them on several threaded bars to prevent the damned screw-collars from coming loose all the time. Although they’re not going to work on every so-called 1-inch bar, for me they turned out to be a decent deal considering there’s not much more than high-priced options of dubious quality [plastic] out there these days. They require a 5/32”, or 4mm Allen key for the set screw.

Perfect for project