StandardNPTTapDrillSizesChart.pdf
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Standard NPT Tap Drill Sizes |
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| NPT Size | Tap Drill Size (in.) | Decimal Equivalent (in.) |
| 1/16 – 27 | “C” | 0.242 |
| 1/8 – 27 | “Q” | 0.332 |
| 1/4 – 18 | 7/16 | 0.438 |
| 3/8 – 18 | 9/16 | 0.562 |
| 1/2 – 14 | 45/64 | 0.703 |
| 3/4 – 14 | 29/32 | 0.906 |
| 1.0 – 11 – 1/2 | 1-9/64 | 1.141 |
| 1 – 1/4 – 11 – 1/2 | 1-31/64 | 1.484 |
| 1 – 1/2 – 11 – 1/2 | 1-23/32 | 1.719 |
| 2.0 – 11 – 1/2 | 2-3/16 | 2.188 |
| 2 – 1/2 – 8 | 2-39/64 | 2.609 |
| 3.0 – 8 | 3-15/64 | 3.234 |