| Nominal Dia. |
Major Dia. |
Major Dia. |
Tapping Drill Size |
TPI | Pitch |
|---|---|---|---|---|---|
| #1-64 | 0.073 | #53 | 0.0595 | 64 | 0.397 |
| #2-56 | 0.086 | #50 | 0.07 | 56 | 0.453 |
| #3-48 | 0.099 | #47 | 0.0785 | 48 | 0.529 |
| #4-40 | 0.112 | #43 | 0.089 | 40 | 0.635 |
| #5-40 | 0.125 | #38 | 0.1015 | 40 | 0.635 |
| #6-32 | 0.138 | #36 | 0.1065 | 32 | 0.794 |
| #8-32 | 0.164 | #29 | 0.136 | 32 | 0.794 |
| #10-24 | 0.19 | #25 | 0.1495 | 24 | 1.058 |
| #12-24 | 0.216 | #17 | 0.173 | 24 | 1.058 |
| 1/4”-20 | 0.25 | #7 | 0.201 | 20 | 1.27 |
| 5/16”-18 | 0.313 | F | 0.257 | 18 | 1.411 |
| 3/8”-16 | 0.375 | 5/16 | 0.3125 | 16 | 1.587 |
| 1/2”-13 | 0.5 | 27/64 | 0.421875 | 13 | 1.954 |
| 9/16”-12 | 0.563 | 31/64 | 0.484375 | 12 | 2.117 |
| 5/8”-11 | 0.625 | 17/32 | 0.53125 | 11 | 2.309 |
| 3/4”-10 | 0.75 | 41/64 | 0.640625 | 10 | 2.54 |
| 7/8”-9 | 0.875 | 49/64 | 0.765625 | 9 | 2.822 |
| 1”-8 | 1 | 7/8 | 0.875 | 8 | 3.175 |
| 1-1/8”-7 | 1.125 | 63/64 | 0.984375 | 7 | 3.628 |
| 1-1/4”-7 | 1.25 | 1-7/64 | 1.109375 | 7 | 3.628 |
| 1-1/2”-6 | 1.5 | 1-11/32 | 1.34375 | 6 | 4.233 |
| 1-3/4”-5 | 1.75 | 1-35/64 | 1.546875 | 5 | 5.08 |
| 2”-4.5 | 2 | 1-25/32 | 1.78125 | 4.5 | 5.644 |
| 2-1/4”-4.5 | 2.25 | 2-1/32 | 2.03125 | 4.5 | 5.644 |
| 2-1/2”-4 | 2.5 | 2-1/4 | 2.25 | 4 | 6.35 |
| 2-3/4”-4 | 2.75 | 2-1/2 | 2.5 | 4 | 6.35 |
| 3”-4 | 3 | 2-3/4 | 2.75 | 4 | 6.35 |
| 3-1/4”-4 | 3.25 | 3 | 3 | 4 | 6.35 |
| 3-1/2”-4 | 3.5 | 3-1/4 | 3.25 | 4 | 6.35 |
| 3-3/4”-4 | 3.75 | 3-1/2 | 3.5 | 4 | 6.35 |
| 4”-4 | 4 | 3-3/4 | 3.75 | 4 | 6.35 |