Licenses
Licenses and sources
The published sources and open-source parts this site uses, and their licenses.
Sources used on the site today
| What | From | Used for |
|---|---|---|
| Unified thread formulas and sizes | Unified Thread Standard, Wikipedia (cites ASME B1.1-2024), read November 13, 2026 | The basic-profile formulas and the 1/4-20 size in the worked example |
| Percent-of-thread constants | FM Carbide, tap drill calculator page, read November 13, 2026 | The cut-tap and form-tap hole formulas and the usual thread ranges |
| Drill diameters | Drill bit sizes, Wikipedia (cites ASME B94.11M), read November 13, 2026 | Number drill diameters in the worked example table |
| DejaVu Sans | The DejaVu fonts project (dejavu-fonts.github.io) | Lettering drawn into the share image and app icons (not served as a font). Bitstream Vera Fonts License; DejaVu changes in the public domain |
Formulas and standard sizes are facts and are used as such; the tables and drawings on this site are computed by our own code. Wikipedia text is under CC BY-SA; we quote no text from it. The DejaVu license allows the fonts to be used, copied and distributed freely, with its copyright and permission notice kept; the full text is in the DejaVu license.
Our own work
The pages, the thread drawing, the calculator code and the MetalShopMath mark are our own work. The pages use your device’s own system fonts and no third-party code. Scripts from outside this site: our self-hosted Umami counter, and Google Analytics only if you accept it (see privacy).