ASME B1.529° flank
ACME Threads
The inch power thread — the inch counterpart of the trapezoidal form. Found on vice screws, lead screws and valve stems, usually in a matching nut rather than with a standard fastener. 10 designations are listed here, all quoted in inches.
Dimensions
in| Designation | TPI | Major (in) | Pitch Ø (in) | Minor ext (in) | Tap drill (in) |
|---|---|---|---|---|---|
| 1/4-16 ACME | 16 | 0.25 | 0.2189 | 0.1673 | 0.1874 |
| 5/16-14 ACME | 14 | 0.3126 | 0.2768 | 0.2213 | 0.2409 |
| 3/8-12 ACME | 12 | 0.3748 | 0.3335 | 0.2717 | 0.2917 |
| 1/2-10 ACME | 10 | 0.5 | 0.45 | 0.3799 | 0.4 |
| 5/8-8 ACME | 8 | 0.6252 | 0.5626 | 0.4799 | 0.5 |
| 3/4-6 ACME | 6 | 0.75 | 0.6665 | 0.5634 | 0.5835 |
| 1-5 ACME | 5 | 1 | 0.9 | 0.7799 | 0.8 |
| 1-1/4-5 ACME | 5 | 1.25 | 1.15 | 1.0299 | 1.05 |
| 1-1/2-4 ACME | 4 | 1.5 | 1.3748 | 1.2299 | 1.25 |
| 2-4 ACME | 4 | 2 | 1.8748 | 1.7299 | 1.75 |