We stock Model Taper Pipe Thread (MTP) taps & dies in various sizes. This thread system is a miniature version of American National Taper Pipe thread with the same taper of 3/4" per foot and the same 60 degree thread form.
These taps & dies are made of high speed steel and the standards governing the dimensions are based directly on applicable ANSI/ASME B 1.20 - 1983 standards.
| Size | Tap Drill Size |
| 1/8-56 | #40 |
| 5/32-48 | #30 |
| 3/16-40 | #23 |
| 1/4-40 | #5 |
| 5/16-27 | "D" |
| 5/16-40 | 21/64" |
| 3/8-40 | 27/64" |