Contact Us
Corrections are the most useful thing you can send. If a conversion value, thread spec or tap drill size on this site does not match your reference, tell us which page and which row. Every chart is generated from a single dataset, so a fix propagates everywhere the value appears.
Send a Message
The form posts to a third-party static form handler rather than to a server on this site. This is a static site with no backend, so nothing you type is processed or stored here. If you would rather not use a form, email works just as well.
What to Include
- For a correction: the page URL, the specific row or value, what it currently says, and what it should say. A reference standard number helps but is not required.
- For a missing size: the size and the standard it comes from. Charts are generated from a dataset, so adding a size adds it everywhere at once.
- For a new chart: what you were trying to look up and where you expected to find it.
- For a display problem: your browser and roughly how wide your screen is. Tables scroll horizontally by design on narrow screens, but anything else is a bug.
Before You Write
Most questions are already answered on the charts themselves. Whether two specific sizes can be substituted is what the socket conversion calculator rates directly, in both directions and with the difference stated in thousandths of an inch. How the site is put together and where its data comes from is covered on the about page, and the sitemap lists every chart on the site on one page if you are not sure which one you need.