45/64 Inch to MM
Fractional inch to millimeters
45/64 inch (45/64β³)
17.859375 mm
= 1.785937 cm Β· 0.703125 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
45/64 to mm Β· 45/64 in mm Β· 45/64" in mm Β· 45/64 inch in mm Β· 45/64 inches to millimeters Β· 45/64 en mm Β· 0.703125 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
18 mm
45/64β³ = 17.859375 mm Β· difference 0.1406 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.1406 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 |
|---|---|---|---|
| 43/64β³ | 17.065625 mm | 1.706562 cm | 0.671875β³ |
| 11/16β³ | 17.4625 mm | 1.74625 cm | 0.6875β³ |
| 45/64β³ | 17.859375 mm | 1.785937 cm | 0.703125β³ |
| 23/32β³ | 18.25625 mm | 1.825625 cm | 0.71875β³ |
| 47/64β³ | 18.653125 mm | 1.865312 cm | 0.734375β³ |
45/64β³ is 45/64 of an inch β the 45th mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 45/64 inch?
45/64 inch equals 17.859375 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 45 Γ· 64.
What is 45/64 inch in decimal?
45/64 inch is 0.703125 inch in decimal, which is 17.859375 mm or 1.785937 cm.
Which metric size is closest to 45/64 inch?
18 mm is the closest common metric size, a difference of 0.1406 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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