21/32 Inch to MM
Fractional inch to millimeters
21/32 inch (21/32β³)
16.66875 mm
= 1.666875 cm Β· 0.65625 inch decimal Β· 1 inch = 25.4 mm exactly
π‘ Common SAE socket, wrench and drill bit size β thirty-seconds are the usual step between sixteenth-inch sizes.
Also written as
21/32 to mm Β· 21/32 in mm Β· 21/32" in mm Β· 21/32 inch in mm Β· 21/32 inches to millimeters Β· 21/32 en mm Β· 0.65625 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
17 mm
21/32β³ = 16.66875 mm Β· difference 0.3313 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.3313 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 |
|---|---|---|---|
| 19/32β³ | 15.08125 mm | 1.508125 cm | 0.59375β³ |
| 5/8β³ | 15.875 mm | 1.5875 cm | 0.625β³ |
| 21/32β³ | 16.66875 mm | 1.666875 cm | 0.65625β³ |
| 11/16β³ | 17.4625 mm | 1.74625 cm | 0.6875β³ |
| 23/32β³ | 18.25625 mm | 1.825625 cm | 0.71875β³ |
21/32β³ is 42/64 of an inch β the 42nd mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 21/32 inch?
21/32 inch equals 16.66875 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 21 Γ· 32.
What is 21/32 inch in decimal?
21/32 inch is 0.65625 inch in decimal, which is 16.66875 mm or 1.666875 cm.
Which metric size is closest to 21/32 inch?
17 mm is the closest common metric size, a difference of 0.3313 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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