6.35
Direct Conversion Formula0.25 in*
25.4 mm
1 in
=
6.35 mm
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A quarter inch! Or, in metric terms, a 1/4" is equivalent to 6.35 millimeters.
25.4 millimeters in an inch ... 10 millimeters in one centimeter, 1000 mm (millimeters) in one meter
One-fifth of an inch = 5.08 millimeters
There are four quarter inches in one inch. This is because an inch can be divided into four equal parts, each representing a quarter of an inch. Therefore, when measuring in inches, each inch can be further subdivided into four quarter-inch segments.
4 (quarter = fourth of, as in 1/4)