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Pipe Taps - Drill Sizes
Drill sizes for British Whitworth Standard and Briggs American Standard pipe taps
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Drill sizes for Briggs - American Standard - and Whitworth - British Standard - pipe taps can be taken from the tables below.
Whitworth - British Standard - Taps
| Size Taps (inches) |
Thread (inches) |
Drill (inches) |
| 1/8 | 28 | 5/16 |
| 1/4 | 19 | 7/16 |
| 3/8 | 19 | 9/16 |
| 1/2 | 14 | 23/32 |
| 5/8 | 14 | 25/32 |
| 3/4 | 14 | 29/32 |
| 7/8 | 14 | 1 1/16 |
| 1 | 11 | 1 5/32 |
| 1 1/4 | 11 | 1 1/2 |
| 1 1/2 | 11 | 1 23/32 |
| 1 3/4 | 11 | 1 31/32 |
| 2 | 11 | 2 3/16 |
| 2 1/4 | 11 | 2 13/32 |
| 2 1/2 | 11 | 2 25/32 |
| 2 3/4 | 11 | 3 1/32 |
| 3 | 11 | 3 9/32 |
| 3 1/4 | 11 | 3 1/2 |
| 3 1/2 | 11 | 3 3/4 |
| 3 3/4 | 11 | 4 |
| 4 | 11 | 4 1/4 |
Briggs - American Standard - Taps
| Size Taps (inches) |
Thread (inches) |
Drill (inches) |
| 1/8 | 27 | 21/64 |
| 1/4 | 18 | 27/64 |
| 3/8 | 18 | 9/16 |
| 1/2 | 14 | 11/16 |
| 3/4 | 14 | 29/32 |
| 1 | 11 1/2 | 1 1/8 |
| 1 1/4 | 11 1/2 | 1 15/32 |
| 1 1/2 | 11 1/2 | 1 23/32 |
| 2 | 11 1/2 | 2 3/16 |
| 2 1/2 | 8 | 2 9/16 |
| 3 | 8 | 3 3/16 |
| 3 1/2 | 8 | 3 11/16 |
| 4 | 8 | 4 3/16 |
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Related Topics
- Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more
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Related Documents
- Briggs Standard Pipe Taps - Drill Sizes - Drill sizes for Briggs Standard Pipe taps
- NPT- National Pipe Thread Taper- ANSI B1.20.1 - NPT pipe threads - dimensions according ANSI/ASME B1.20.1
- Pipe Threads where Pressuretight Joints are made on the Threads - ISO 7-1 - ISO 7-1:1994 Pipe threads where pressure-tight joints are made on the threads
- Thread Standards - Piping - Piping thread standards
- Thread Standards Used for Piping and Fluid Connectors - Thread designations and standards for threads used in piping and fluid connectors
- Threads - Metric ISO 724 - M Thread (metric ISO 724 thread) Standard in Europe
