4mm = 4/25.4 in = 40/254 = 20/127 inch.
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4mm is about 0.157480315 inches, *64 is just over 10, so 10/64 (5/32) is the closest fractional size.
There is no such thing as a USA standard. 4mm is the same length as 0.16 inches, approximately.
You first convert them to equivalent fractions with a common denominator. Or you convert them to decimal fractions.
A pair of sissors will convert dollars into fractions...
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