I had the most bizarre experience of trying to determine what kind of nut I have. I own a Schwinn Santis made by Pacific Bicycles.
The rear tire had a bolt and nut.
I took the nut to Home Depot and we determined that it was 3/8" diameter with a 24 thread count. We used a tool they had to do this and I called Pacific Bicycle to confirm.
It kind of looks like this nut here except for one thing:
The width is not 9/16".
I tried a 9/16 and it was too small. I tried a 10/16 and it was too big. I called Husky and they told me they don't make a 19/32 with would have been about the right size.
What did end up working was a 15mm.
What I find confusing is the threading is using english units while the tool part is using metric units.
This is not a problem, I could just use an adjustable wrench, but more of a curiosity question.
Has anyone else seen something like this? Why would they do this?
I do need to get a high quality caliper that can measure to this level of smallness.