15/64 Inch to MM

Fractional inch to millimeters

15/64 inch (15/64β€³)
5.953125 mm
= 0.595313 cm Β· 0.234375 inch decimal Β· 1 inch = 25.4 mm exactly
πŸ’‘ Standard fractional drill bit size. 1/64 in is also the finest graduation printed on a US tape measure.
Also written as

15/64 to mm Β· 15/64 in mm Β· 15/64" in mm Β· 15/64 inch in mm Β· 15/64 inches to millimeters Β· 15/64 en mm Β· 0.234375 inch to mm

All of these mean the same measurement. The double-prime mark (β€³) and the plain quote (") both stand for inches, and en mm is simply the French and Spanish wording of the same question.
Closest metric drill size
6 mm
15/64β€³ = 5.953125 mm Β· difference 0.0469 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.0469 mm gap is usually invisible in a clearance hole but changes the fit on a press fit or a tapped hole.
Nearby fractional inches
FractionmmcmDecimal
13/64β€³5.159375 mm0.515937 cm0.203125β€³
7/32β€³5.55625 mm0.555625 cm0.21875β€³
15/64β€³5.953125 mm0.595313 cm0.234375β€³
1/4β€³6.35 mm0.635 cm0.25β€³
17/64β€³6.746875 mm0.674687 cm0.265625β€³
15/64β€³ is 15/64 of an inch β€” the 15th mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 15/64 inch?
15/64 inch equals 5.953125 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ— 15 Γ· 64.
What is 15/64 inch in decimal?
15/64 inch is 0.234375 inch in decimal, which is 5.953125 mm or 0.595313 cm.
Which metric size is closest to 15/64 inch?
6 mm is the closest common metric size, a difference of 0.0469 mm. Fractional-inch and metric fasteners are not interchangeable when the gap is more than about 0.2 mm.
Why is the value exact?
The international yard and pound agreement of 1959 fixed the inch at exactly 25.4 mm, so fractional inch conversions terminate rather than repeat.
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15/64 inch to mm

15/64 inch is 25.4 Γ— 15 Γ· 64 = 5.953125 mm, or 0.595313 cm. In decimal inches it is 0.234375β€³. Because the inch is defined as exactly 25.4 millimeters, fractional inch values convert without rounding.

Where this size shows up

Standard fractional drill bit size. 1/64 in is also the finest graduation printed on a US tape measure.

Matching it to metric

The nearest metric drill size is 6 mm, a difference of 0.0469 mm. Whether that matters depends on the job: a clearance hole tolerates it, a press fit or a tapped hole does not. For hex fasteners the same logic applies to socket sizes β€” a socket even a few tenths oversize will round the corners of the head.

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