Fractional drill · 11/64
11/64" Drill Bit Size — Decimal Inch, Millimetre and Tap Sizes
https://shopmath.org/drills/fractional/11-64 · data verified August 1, 2026
A 11/64" drill bit is 0.1719 in (4.366 mm) in diameter. Diameters are nominal.
- Series
- Fractional
- Designation
- 11/64
- Inch
- 0.1719
- mm
- 4.366
- Standard
- ANSI/ASME B94.11M
Fractional Drill · 11/64 · nominal diameter
0.1719 in
- Millimetre
- 4.366mm
- Fraction
- 11/64in
Nominal diameter. A worn or run-out drill cuts oversize, which leaves less thread in a tapped hole than the table says.
11/64" Drill Bit Size in Inches and Millimetres
The nominal diameter of a 11/64" drill bit. Drill sizes are nominal — a worn drill, run-out or a soft material that closes in behind the cut all move the finished hole.
| Property | Value |
|---|---|
| Diameter, decimal inch | 0.1719 in |
| Diameter, millimetre | 4.366 mm |
| Fraction | 11/64 in |
| Cross-sectional area | 0.02320 in² |
1 in = 25.4 mm exactly, so the two columns are the same value in different units, not two measurements.
11/64" Drill Bit Equivalents in Every Other Drill Series
The closest size to the 11/64" drill bit in each of the other three indexes, with the difference in inches. None of them is the same drill — check the difference before substituting one into a tapped hole.
| Property | Property | Diameter | Property | |
|---|---|---|---|---|
| Drill | Series | in | mm | Difference, in |
| #17 | Number | 0.1730 | 4.394 | +0.0011 |
| A | Letter | 0.2340 | 5.944 | +0.0621 |
| 4.4 mm | Metric | 0.1732 | 4.400 | +0.0014 |
A positive difference means the equivalent drill is larger, which leaves less thread in a tapped hole. Sizes without a link are stored for the nearest-drill calculation but do not carry their own page.
Drill Sizes Either Side of the 11/64" Drill Bit
Ordered by diameter across all four indexes, so the next size up may be a letter, a fraction or a metric drill rather than the next one in this series.
Sources and Method for the 11/64" Drill Bit Size
- Drill diametercomputed
Number/letter: bd_warehouse drill_sizes.csv (Apache-2.0) cross-checked against Wikipedia Drill bit sizes (CC BY-SA 4.0). Fractional: computed 1/64 in steps per ANSI B94.11M. Metric: computed BS 328 increment pattern.
Verified against Wikipedia Drill bit sizes (CC BY-SA 4.0); 31/31 checks passed
Computed from the standard's formulas, then checked against published tables.
- Formula
Fractional drill diameter
Ø = 11/64 in = 0.1719 in
Fractional drills are exact fractions of an inch in 1/64 in steps; the decimal is the fraction evaluated, not a measurement.
- Assumptions
- Diameters are nominal. Drill manufacturing tolerance, wear and run-out all cut oversize, and every one of those moves a tapped hole toward less thread than the table says.
- Dataset scope: Number sizes #61-#80 are stored but tagged demandTier 'extended' — query-space-map.md Appendix A found the tail thinning in the 60s. Sizes below #80 and metric sizes above 25.0 mm excluded.
- Data last verified
- August 1, 2026
How to Cite This 11/64" Drill Bit Reference
Citation
ShopMath. "11/64" Drill Bit Size — Decimal Inch, Millimetre and Tap Sizes." ShopMath, verified August 1, 2026, https://shopmath.org/drills/fractional/11-64
BibTeX
@misc{shopmath-drills-fractional-11-64,
title = {11/64" Drill Bit Size — Decimal Inch, Millimetre and Tap Sizes},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/drills/fractional/11-64}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/drills/fractional/11-64
Common Questions About the 11/64" Drill Bit
What size is a 11/64" drill bit?
- A 11/64" drill bit is 0.1719 in in diameter, which is 4.366 mm. It is the 11/64 in fractional size.
What is the metric equivalent of a 11/64" drill bit?
- The closest metric drill to a 11/64" drill bit (4.366 mm) is 4.4 mm, which is 4.400 mm — 0.0014 in larger.
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