| Tap Drill | Clearance Drill | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Aluminum, Brass, Plastics | Steel, Stainless Steel, Iron | Close Fit | Standard Fit | |||||||
| 75% Thread | 50% Thread | |||||||||
| Screw Size | Major Dia (in) | Threads Per Inch | Drill Size | Dec. Eq. | Drill Size | Dec. Eq. | Drill Size | Dec. Eq. | Drill Size | Dec. Eq. |
| 2-56 | .0860 | 56 | 50 | .0700 | 49 | .0730 | 43 | .0890 | 41 | .0960 |
| 2-64 | A | B | C | D | E | F | ||||
| 4-40 | .1120 | 40 | 43 | .0890 | 41 | .0960 | 32 | .1160 | 30 | .1285 |
| 4-48 | A | B | C | D | E | F | ||||
| 6-32 | .1120 | 40 | 43 | .0890 | 41 | .0960 | 27 | .1440 | 25 | .1495 |
| 6-40 | A | B | C | D | E | F | ||||
| 8-32 | .1120 | 40 | 43 | .0890 | 41 | .0960 | 18 | .1695 | 16 | .1770 |
| 8-36 | A | B | C | D | E | F | ||||
| 10-24 | .1120 | 40 | 43 | .0890 | 41 | .0960 | 9 | .1960 | 7 | .2010 |
| 10-32 | A | B | C | D | E | F | ||||
| 12-24 | .1120 | 40 | 43 | .0890 | 41 | .0960 | 2 | .2210 | 1 | .2280 |
| 12-28 | A | B | C | D | E | F | ||||
| 12-32 | A | B | C | D | E | F | ||||
| 1/4-20 | .1120 | 40 | 43 | .0890 | 41 | .0960 | F | .2570 | H | .2660 |
| 1/4-28 | A | B | C | D | E | F | ||||
| 1/4-32 | A | B | C | D | E | F | ||||
| The values are taken from ... | ||||||||||