27/64 Inch to MM
Fractional inch to millimeters
27/64 inch (27/64β³)
10.715625 mm
= 1.071562 cm Β· 0.421875 inch decimal Β· 1 inch = 25.4 mm exactly
π‘ Standard fractional drill bit size. 1/64 in is also the finest graduation printed on a US tape measure.
Also written as
27/64 to mm Β· 27/64 in mm Β· 27/64" in mm Β· 27/64 inch in mm Β· 27/64 inches to millimeters Β· 27/64 en mm Β· 0.421875 inch to mm
All of these mean the same measurement. The double-prime mark (β³) 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
10.5 mm
27/64β³ = 10.715625 mm Β· difference 0.2156 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.2156 mm gap is usually invisible in a clearance hole but changes the fit on a press fit or a tapped hole.
Nearby fractional inches
| Fraction | mm | cm | Decimal |
|---|---|---|---|
| 25/64β³ | 9.921875 mm | 0.992188 cm | 0.390625β³ |
| 13/32β³ | 10.31875 mm | 1.031875 cm | 0.40625β³ |
| 27/64β³ | 10.715625 mm | 1.071562 cm | 0.421875β³ |
| 7/16β³ | 11.1125 mm | 1.11125 cm | 0.4375β³ |
| 29/64β³ | 11.509375 mm | 1.150937 cm | 0.453125β³ |
27/64β³ is 27/64 of an inch β the 27th mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 27/64 inch?
27/64 inch equals 10.715625 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 27 Γ· 64.
What is 27/64 inch in decimal?
27/64 inch is 0.421875 inch in decimal, which is 10.715625 mm or 1.071562 cm.
Which metric size is closest to 27/64 inch?
10.5 mm is the closest common metric size, a difference of 0.2156 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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