| Nominal Dia. |
Major Dia. |
Major Dia. |
Tapping Drill Size |
TPI | Pitch |
|---|---|---|---|---|---|
| #1-64 | 1.854 | #53 | 1.5 | 64 | 0.397 |
| #2-56 | 2.184 | #50 | 1.78 | 56 | 0.453 |
| #3-48 | 2.515 | #47 | 2.05 | 48 | 0.529 |
| #4-40 | 2.845 | #43 | 2.27 | 40 | 0.635 |
| #5-40 | 3.175 | #38 | 2.59 | 40 | 0.635 |
| #6-32 | 3.505 | #36 | 2.77 | 32 | 0.794 |
| #8-32 | 4.166 | #29 | 3.42 | 32 | 0.794 |
| #10-24 | 4.826 | #25 | 3.82 | 24 | 1.058 |
| #12-24 | 5.486 | #17 | 4.47 | 24 | 1.058 |
| 1/4”-20 | 6.35 | #7 | 5.11 | 20 | 1.27 |
| 5/16”-18 | 7.938 | F | 6.55 | 18 | 1.411 |
| 3/8”-16 | 9.525 | 5/16 | 7.95 | 16 | 1.587 |
| 1/2”-13 | 12.7 | 27/64 | 10.73 | 13 | 1.954 |
| 9/16”-12 | 14.288 | 31/64 | 12.15 | 12 | 2.117 |
| 5/8”-11 | 15.875 | 17/32 | 13.53 | 11 | 2.309 |
| 3/4”-10 | 19.05 | 41/64 | 16.46 | 10 | 2.54 |
| 7/8”-9 | 22.225 | 49/64 | 19.34 | 9 | 2.822 |
| 1”-8 | 25.4 | 7/8 | 22.15 | 8 | 3.175 |
| 1-1/8”-7 | 28.575 | 63/64 | 24.87 | 7 | 3.628 |
| 1-1/4”-7 | 31.75 | 1-7/64 | 28.05 | 7 | 3.628 |
| 1-1/2”-6 | 38.1 | 1-11/32 | 33.7 | 6 | 4.233 |
| 1-3/4”-5 | 44.45 | 1-35/64 | 39.26 | 5 | 5.08 |
| 2”-4.5 | 50.8 | 1-25/32 | 45.03 | 4.5 | 5.644 |
| 2-1/4”-4.5 | 57.15 | 2-1/32 | 51.38 | 4.5 | 5.644 |
| 2-1/2”-4 | 63.5 | 2-1/4 | 57 | 4 | 6.35 |
| 2-3/4”-4 | 69.85 | 2-1/2 | 63.36 | 4 | 6.35 |
| 3”-4 | 76.2 | 2-3/4 | 69.71 | 4 | 6.35 |
| 3-1/4”-4 | 82.55 | 3 | 76.06 | 4 | 6.35 |
| 3-1/2”-4 | 88.9 | 3-1/4 | 82.41 | 4 | 6.35 |
| 3-3/4”-4 | 95.25 | 3-1/2 | 88.76 | 4 | 6.35 |
| 4”-4 | 101.6 | 3-3/4 | 95.11 | 4 | 6.35 |