1/64 Inch to MM
Fractional inch to millimeters
1/64 inch (1/64β³)
0.396875 mm
= 0.039688 cm Β· 0.015625 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
1/64 to mm Β· 1/64 in mm Β· 1/64" in mm Β· 1/64 inch in mm Β· 1/64 inches to millimeters Β· 1/64 en mm Β· 0.015625 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
0.5 mm
1/64β³ = 0.396875 mm Β· difference 0.1031 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.1031 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 |
|---|---|---|---|
| 1/64β³ | 0.396875 mm | 0.039688 cm | 0.015625β³ |
| 1/32β³ | 0.79375 mm | 0.079375 cm | 0.03125β³ |
| 3/64β³ | 1.190625 mm | 0.119063 cm | 0.046875β³ |
1/64β³ is 1/64 of an inch β the 1st mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 1/64 inch?
1/64 inch equals 0.396875 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 1 Γ· 64.
What is 1/64 inch in decimal?
1/64 inch is 0.015625 inch in decimal, which is 0.396875 mm or 0.039688 cm.
Which metric size is closest to 1/64 inch?
0.5 mm is the closest common metric size, a difference of 0.1031 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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