> You also have the joy of "the hole for a 17/64ths Whitworth tap is 47.2 thou" or whatever other imperial nonsense machinists have to deal with. It’s worse. T

> You also have the joy of "the hole for a 17/64ths Whitworth tap is 47.2 thou" or whatever other imperial nonsense machinists have to deal with. It’s worse. The drill size for a 7/16” coarse tap is ‘U’.