Pre Tap Drill Size
Pipe Tap NPSC
Tap | Drill Size | Decimal Equivalent |
|---|---|---|
2in - 11-1/2 | 2in 13/64 | 2.2031 |
1in1/2 - 11-1/2 | 1in 47/64 | 1.7343 |
1in1/4 - 11-1/2 | 1in 1/2 | 1.500 |
1in - 11-1/2 | 1in 5/32 | 1.1562 |
3/4 - 14 | 59/64 | 0.9218 |
1/2 - 14 | 18MM | 0.7086 |
3/8 - 18 | 37/64 | 0.5781 |
1/4 - 18 | 7/16 | 0.4375 |
1/8 - 27 | Q .332 | 0.332 |
1/16 - 27 | 1/4 | 0.250 |