aellman wrote:
A very good guess. You are an old-timer like me, but I doubt that you know every use of a 10mm nut in the last 100 years or more. I'm sure there have been MANY of them, not even including the nuts here. I tried three image identification sites, and the best they could come up with was "pickaxe." I guess that technology has not yet matured.
10mm square = approx a 6mm - 6.5 mm thread Not gonna happen on a wheel lug nut! and I am 76 yrs old and worked as a mechanic and worked on farms during the summer since I was 17 I also take interest in OLD machinery and tools and have worked on Shoe machinery that was over 100 yrs old for approx 5 yrs.
I too have tried a Google search : so far unsuccessful .