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I am trying to find the dimensional tolerance on US electrical plugs. I have tried looking online, but I have only been able to find that they are called NEMA 1-15, and have found the picture below showing length and height for the male connector (but not width of the male prong), and I haven't been able to find dimensional tolerances anywhere.

NEMA 1-15 Plug Dimensions

I ask here because I'm assuming there's a US code that governs electrical plugs, but I can't seem to find the standard anywhere.

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You can find the dimensions in ANSI/NEMA WD 6. The standard costs money, but the free excerpt (linked above) will probably suit your purposes:

enter image description here

Dimensions are in inches, of course.

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