National Pipe Tapered Tap (NPT) Chart
ANSI Thredfloer Hole Size Chart; Metric Thredfloer Hole Size Chart; ANSI STI Thredfloer Hole Size Chart; Metric STI Thredfloer Hole Size Chart; Thredfloer Pre-Tap Considerations; Thredfloer Diecast Cored Holes; ANSI Thredshaver Hole Size Chart; Metric and Pipe Thredshaver Hole Size Chart; Surface Treatments; Suggested Tapping Speeds; Thread.
Tap Size | Drill Size | Tap and Drill Set |
1/16' NPT Tap | 'C' Drill Bit | Only Sold Individually |
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 |
1-1/4' NPT Tap | 1-1/2' Drill Bit | Only Sold Individually |
1-1/2' 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 |
Our most popular NPT Tap Sets: