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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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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