4mm is about 0.157480315 inches, *64 is just over 10, so 10/64 (5/32) is the closest fractional size.
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4mm = 4/25.4 in = 40/254 = 20/127 inch.
There is no such thing as a USA standard. 4mm is the same length as 0.16 inches, approximately.
maybe its uhm 24mm?
1/16 inch = (1/16 * 25.4) = 1.5875 mm so, 4 mm = 4 / 1.5875 = 2.5197 sixteenths of an inch
4mm is smaller than 5mm