M10x1.25 vs M12x1.25 ATV Lug Nuts
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M10x1.25 vs M12x1.25 ATV Lug Nuts
M10x1.25 and M12x1.25 look similar in text, but they do not fit the same studs.
The difference
M10x1.25 uses a 10mm stud diameter. M12x1.25 uses a 12mm stud diameter. The 1.25 number is the thread pitch, not the stud size.
How to avoid mistakes
Search by your exact ATV or UTV model, then verify the stud size before purchasing. Never force a lug nut that does not spin on by hand.