Combination Drill Bit/Pipe and Conduit Thread Taps
Drill and thread holes for pipe and conduit without switching tools. Made of uncoated high-speed steel, these tools are for use on most metal and plastic. Their right-hand spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. With a square shank, they're compatible with tap wrenches and tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping of through holes.
Drill Bit | Plug Chamfer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Thread Type | Threads Per Inch | Thread Lg. | Overall Lg. | Size | Decimal Size Equivalent | Point Angle | No. of Flutes | Each | |
Uncoated High-Speed Steel | ||||||||||
| 1/8 | NPTF | 27 | 3/4" | 2 7/8" | Q | 0.332" | 118° | 4 | 0000000 | 0000000 |
| 1/4 | NPTF | 18 | 1 1/16" | 3 5/16" | 7/16" | 0.4375" | 118° | 4 | 0000000 | 000000 |
| 3/8 | NPTF | 18 | 1 1/16" | 3 1/2" | 9/16" | 0.5625" | 118° | 4 | 0000000 | 000000 |
| 1/2 | NPTF | 14 | 1 3/8" | 4 3/8" | 45/64" | 0.7031" | 118° | 4 | 0000000 | 000000 |
| 3/4 | NPTF | 14 | 1 3/8" | 4 9/16" | 29/32" | 0.9063" | 118° | 6 | 0000000 | 000000 |
| 1 | NPTF | 11 1/2 | 1 3/4" | 5 3/8" | 1 9/64" | 1.1406" | 118° | 6 | 0000000 | 000000 |