DERNORD Cast Pipe Fitting Stainless Steel 304 Hex Locknut NPT Female 0.5 Inch DERNORD-1501193

These stainless steel locknuts on the inner diameter are what I need to attach to a 1-1/4" MPT component, however, the outer dimensions are different for 3 of the 8 nuts I ordered. The part number on each of the 8 packages is identical: X001CAPGX9, however, whoever packaged them put two different nuts in 3 of the 8 packages.The dimensions of the 5 smaller outer diameter nuts (the ones I need) delivered in my order are shown in the picture I attached: 2" between flat sides and 2-9/32" between vertices.The dimensions of the 3 larger outer diameter nuts (too big for my application) delivered in my order are also shown in the picture I attached: 2-5/32" between flat sides and 2-15/32" between vertices.Amazon is sending me 3 replacements and I hope they are the right size (the smaller dimensions).

The nuts are functional and I had no problem threading it onto a male fitting. The edges are rough however, and there is no uniformity between the two in terms of size, thickness or width. About the only thing consistent is the inside threading. So like I said, they do the job, but they aren't the prettiest or nicest nut in the drawer.

These hex lock nuts have a much smaller OD compared to what is typically supplied with most home brew stainless steel fittings. They do not work with 210 silicone o-rings.

My shower head came with a cheap plastic lock nut that wouldn't stay tight to keep me shower head from moving. I replaced that lock nut with one of these and problem solved.

All parts were made well and it works as expected