Pre Tap Drill Size
Pipe Tap NPT & NPTF
Tap | Drill Size | Decimal Equivalent |
|---|---|---|
2 - 11-1/2 | 2in 3/16 | 2.1875 |
1-1/2 - 11-1/2 | 1in 23/32 | 1.7187 |
1-1/4 - 11-1/2 | 1in 31/64 | 1.4843 |
1 - 11-1/2 | 1in 9/64 | 1.1406 |
3/4 - 14 | 29/32 | 0.9062 |
1/2 - 14 | 45/64 | 0.7031 |
3/8 - 18 | 9/16 | 0.5625 |
1/4 - 18 | 7/16 | 0.4375 |
1/8 - 27 | Q | .332 |
1/16 - 27 | C | .242 |