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Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming can be taken from the table below:
| Size of Pipe (inches) |
Size of Pipe (inches) |
| 1/8 | 21/64 |
| 1/4 | 7/16 |
| 3/8 | 9/16 |
| 1/2 | 45/64 |
| 3/4 | 29/32 |
| 1 | 1 9/64 |
| 1 1/4 | 1 31/64 |
| 1 1/2 | 1 47/64 |
| 2 | 2 13/64 |
| 2 1/2 | 2 5/8 |
| 3 | 3 1/4 |
| 3 1/2 | 3 47/64 |
| 4 | 4 15/64 |
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