31/64 Inch to MM
Fractional inch to millimeters
31/64 inch (31/64β³)
12.303125 mm
= 1.230312 cm Β· 0.484375 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
31/64 to mm Β· 31/64 in mm Β· 31/64" in mm Β· 31/64 inch in mm Β· 31/64 inches to millimeters Β· 31/64 en mm Β· 0.484375 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
12.5 mm
31/64β³ = 12.303125 mm Β· difference 0.1969 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.1969 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 |
|---|---|---|---|
| 29/64β³ | 11.509375 mm | 1.150937 cm | 0.453125β³ |
| 15/32β³ | 11.90625 mm | 1.190625 cm | 0.46875β³ |
| 31/64β³ | 12.303125 mm | 1.230312 cm | 0.484375β³ |
| 1/2β³ | 12.7 mm | 1.27 cm | 0.5β³ |
| 33/64β³ | 13.096875 mm | 1.309688 cm | 0.515625β³ |
31/64β³ is 31/64 of an inch β the 31st mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 31/64 inch?
31/64 inch equals 12.303125 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 31 Γ· 64.
What is 31/64 inch in decimal?
31/64 inch is 0.484375 inch in decimal, which is 12.303125 mm or 1.230312 cm.
Which metric size is closest to 31/64 inch?
12.5 mm is the closest common metric size, a difference of 0.1969 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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