9/64 Inch to MM
Fractional inch to millimeters
9/64 inch (9/64β³)
3.571875 mm
= 0.357187 cm Β· 0.140625 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
9/64 to mm Β· 9/64 in mm Β· 9/64" in mm Β· 9/64 inch in mm Β· 9/64 inches to millimeters Β· 9/64 en mm Β· 0.140625 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
3.5 mm
9/64β³ = 3.571875 mm Β· difference 0.0719 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.0719 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 |
|---|---|---|---|
| 7/64β³ | 2.778125 mm | 0.277813 cm | 0.109375β³ |
| 1/8β³ | 3.175 mm | 0.3175 cm | 0.125β³ |
| 9/64β³ | 3.571875 mm | 0.357187 cm | 0.140625β³ |
| 5/32β³ | 3.96875 mm | 0.396875 cm | 0.15625β³ |
| 11/64β³ | 4.365625 mm | 0.436562 cm | 0.171875β³ |
9/64β³ is 9/64 of an inch β the 9th mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 9/64 inch?
9/64 inch equals 3.571875 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 9 Γ· 64.
What is 9/64 inch in decimal?
9/64 inch is 0.140625 inch in decimal, which is 3.571875 mm or 0.357187 cm.
Which metric size is closest to 9/64 inch?
3.5 mm is the closest common metric size, a difference of 0.0719 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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