53/64 Inch to MM
Fractional inch to millimeters
53/64 inch (53/64β³)
21.034375 mm
= 2.103438 cm Β· 0.828125 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
53/64 to mm Β· 53/64 in mm Β· 53/64" in mm Β· 53/64 inch in mm Β· 53/64 inches to millimeters Β· 53/64 en mm Β· 0.828125 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
21 mm
53/64β³ = 21.034375 mm Β· difference 0.0344 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.0344 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 |
|---|---|---|---|
| 51/64β³ | 20.240625 mm | 2.024063 cm | 0.796875β³ |
| 13/16β³ | 20.6375 mm | 2.06375 cm | 0.8125β³ |
| 53/64β³ | 21.034375 mm | 2.103438 cm | 0.828125β³ |
| 27/32β³ | 21.43125 mm | 2.143125 cm | 0.84375β³ |
| 55/64β³ | 21.828125 mm | 2.182812 cm | 0.859375β³ |
53/64β³ is 53/64 of an inch β the 53rd mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 53/64 inch?
53/64 inch equals 21.034375 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 53 Γ· 64.
What is 53/64 inch in decimal?
53/64 inch is 0.828125 inch in decimal, which is 21.034375 mm or 2.103438 cm.
Which metric size is closest to 53/64 inch?
21 mm is the closest common metric size, a difference of 0.0344 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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