Yes, 21/64 is just a bit shy of 1/2. 5/16 = 20/64, so 21/64 is 1/64 over 5/16.
If you have a 1/2 inch drill index, 31/64 is the next smaller drill from 1/2 inch. If that's the one you used, it was misread.
Rear tractor tubes (sounds like you are patching your rear rim from your other post) I am familiar with need a 5/8 clear hole for the tube stem. The stem holds the tube in place with a nylon nut at the base of the stem where it protrudes from the hole in the rim. .453 and .625 are standard rim hole sizes. Apparently, yours is different if you only need a 31/64 hole. I just double checked my spare tube, and the threaded brass area for the nut is 31/64 OD. The rubber, which needs to fit into the rim hole, below the nut, is 5/8 OD. Please double check yours, I'm not trying to jerk you around.
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