Apparently it's superstition. Nissans don't have any 13mm bolts (might be urban myth!). It's 1/2 inch of course, well close anyway, 12.8mm.
So that’s why my grandfather’s old imperial spanners and sockets fit those heads better than my 13mm does!
Yes, it took me a while to work that out in my youth. I had a favourite 1/2 inch I could tap onto a damaged 13mm. Probably the 13mm was damaged from using a 1/2 inch socket though!
@pdlouche started
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Apparently it's superstition. Nissans don't have any 13mm bolts (might be urban myth!). It's 1/2 inch of course, well close anyway, 12.8mm.