| Tap Size or Screw Size | Threads Per Inch | Use This Size Drill Bit | Tap Size or Screw Size | Threads Per Inch | Use This Size Drill Bit |
| No. 5 | 40 | 39 | 1/2" | 13 | 27/64" |
| No. 5 | 44 | 37 | 1/2" | 20 | 29/64" |
| No. 6 | 32 | 36 | 9/16" | 12 | 31/64" |
| No. 6 | 40 | 33 | 9/16" | 18 | 33/64" |
| No. 8 | 32 | 29 | 5/8" | 11 | 17/32" |
| No. 8 | 36 | 29 | 5/8" | 18 | 37/64" |
| No. 10 | 24 | 25 | 3/4" | 10 | 21/32" |
| No. 10 | 32 | 21 | 3/4" | 16 | 11/16" |
| No. 12 | 24 | 17 | 7/8" | 9 | 49/64" |
| No. 12 | 28 | 15 | 7/8" | 14 | 13/16" |
| 1/4" | 20 | 8 | 1" | 8 | 7/8" |
| 1/4" | 28 | 3 | 1-1/8" | 7 | 63/64" |
| 5/16" | 18 | F | 1-1/8" | 12 | 1-3/64" |
| 5/16" | 24 | 1 | 1-1/4" | 7 | 1-7/64" |
| 3/8" | 16 | 5/16" | 1-1/4" | 12 | 1-11/64" |
| 3/8" | 24 | Q | 1-1/2" | 6 | 1-11/32" |
| 7/16" | 14 | U | 1-1/2" | 12 | 1-27/64" |
| 7/16" | 20 | W |
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