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NPT Tap Drill Chart
National Pipe Tapered Tap (NPT) Chart
| Tap Size | Drill Size | Tap and Drill Set |
| 1/8" NPT Tap | "R" Drill Bit | 1/8" NPT Tap and Drill Set |
| 1/4" NPT Tap | 7/16" Drill Bit | 1/4" NPT Tap and Drill Set |
| 3/8" NPT Tap | 37/64" Drill Bit | 3/8" NPT Tap and Drill Set |
| 1/2" NPT Tap | 23/32" Drill Bit | 1/2" NPT Tap and Drill Set |
| 3/4" NPT Tap | 59/64" Drill Bit | 3/4" NPT Tap and Drill Set |
| 1" NPT Tap | 1-5/32" Drill Bit | 1" NPT Tap and Drill Set |
| 1-1/2" NPT Tap | 1-1/2" Drill Bit | Only Sold Individually |
| 1-3/4" NPT Tap | 1-47/64" Drill Bit | Only Sold Individually |
| 2" NPT Tap | 2-7/32" Drill Bit | Only Sold Individually |
| 2-1/2" NPT Tap | 2-5/8" Drill Bit | Only Sold Individually |
| 3" NPT Tap | 3-1/4" Drill Bit | Only Sold Individually |
| 3-1/2" NPT Tap | 3-3/4 Drill Bit | Only Sold Individually |
| 4" NPT Tap | 4-1/4 Drill Bit | Only Sold Individually |
