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Drill Spec Table
Drill KS Specifications — 36 sizes
Drill
36 sizes| Nominal | Dia (mm) | Dia (inch) | System | Note | - |
|---|---|---|---|---|---|
| Ø1.0 | 1 | 0.0394 | Precision Drilling | - | |
| Ø1.6 | 1.6 | 0.063 | M2 | - | |
| Ø2.0 | 2 | 0.0787 | M2.5 | - | |
| Ø2.5 | 2.5 | 0.0984 | M3 | - | |
| Ø3.0 | 3 | 0.1181 | M3.5 | - | |
| Ø3.3 | 3.3 | 0.1299 | M4 | - | |
| Ø4.2 | 4.2 | 0.1654 | M5 | - | |
| Ø5.0 | 5 | 0.1969 | M6 | - | |
| Ø6.8 | 6.8 | 0.2677 | M8 | - | |
| Ø8.5 | 8.5 | 0.3346 | M10 | - | |
| Ø10.2 | 10.2 | 0.4016 | M12 | - | |
| Ø14.0 | 14 | 0.5512 | M16 | - | |
| Ø17.5 | 17.5 | 0.689 | M20 | - | |
| Ø20.0 | 20 | 0.7874 | Large Drilling | - | |
| 1/16″ | 1.588 | 0.0625 | Inch () | Drilling | - |
| 1/8″ | 3.175 | 0.125 | Inch () | General Small | - |
| 3/16″ | 4.763 | 0.1875 | Inch () | General | - |
| 1/4″ | 6.35 | 0.25 | Inch () | 1/4 | - |
| 5/16″ | 7.938 | 0.3125 | Inch () | - | - |
| 3/8″ | 9.525 | 0.375 | Inch () | 3/8 | - |
| 1/2″ | 12.7 | 0.5 | Inch () | 1/2 | - |
| 5/8″ | 15.875 | 0.625 | Inch () | - | - |
| 3/4″ | 19.05 | 0.75 | Inch () | 3/4 | - |
| #60 | 1.016 | 0.04 | #60~#1 SpotSpot | - | |
| #50 | 1.778 | 0.07 | - | - | |
| #40 | 2.489 | 0.098 | - | - | |
| #30 | 3.264 | 0.1285 | 1/8″ | - | |
| #20 | 4.089 | 0.161 | - | - | |
| #10 | 4.915 | 0.1935 | - | - | |
| #1 | 5.791 | 0.228 | - | - | |
| A | 5.944 | 0.234 | A~Z SpotSpot | - | |
| F | 6.528 | 0.257 | - | - | |
| K | 7.036 | 0.281 | - | - | |
| Q | 8.026 | 0.332 | - | - | |
| V | 9.093 | 0.377 | - | - | |
| Z | 10.49 | 0.413 | - | - |
A drill diameter reference covering all four systems at once: metric (Ø1.0–Ø20.0), fractional inch (1/16″–3/4″), gauge (#60–#1), and letter (A–Z). Each entry includes millimeter size, inch size, classification, and notes (tap drill equivalents) — useful for matching inch/gauge drills on North-American drawings to a metric tool box, or locating tap drill sizes instantly. Example: a #30 drill (3.264 mm) can substitute for an M3 tap drill (3.3 mm).