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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