Privacy Policy
This policy explains what information MachinistData collects when you visit, why we collect it, and the choices you have. It applies to the tap drill size charts, calculators and reference data on this site.
Information we collect
We aim to collect as little as possible. MachinistData is a free reference site. We do not require an account, and we do not ask for your name, email or any personal details to use any chart or calculator on the site.
When you visit, basic technical data may be collected automatically, such as your browser type, device type, approximate location (from your IP address) and the pages you view. This is used in aggregate for analytics and to keep the site working correctly.
Advertising cookies (AdSense)
This site displays advertising served by Google, including Google AdSense. Google and its partners may use cookies and similar technologies to show ads that are relevant to you and to measure the performance of those ads.
Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this site and/or other sites on the internet. You may opt out of personalised advertising by visiting Google Ads Settings.
You can also learn more at www.aboutads.info, or opt out of some third-party vendors' use of cookies for personalised advertising at www.aboutads.info/choices.
Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this or other websites. See the Google advertising cookies policy.
How we use information
Any information we gather is used to understand how visitors use the site, improve the charts and calculators, keep the site secure, and to display and measure advertising. We do not sell your personal information.
Analytics
We may use basic, privacy-conscious analytics to count visits and see which pages are most useful. Where analytics are used, the data is aggregated and not used to identify individual visitors.
Cookies and local storage
A cookie is a small file placed on your device. We use cookies where needed for the site to function and for the advertising described above. You can block or delete cookies in your browser settings, though doing so may affect how ads are shown or how the site behaves.
Third-party links
Some pages link to external sites (for example, manufacturer specifications or reference material). We are not responsible for the content or privacy practices of those sites, and we encourage you to read their policies.
Your rights
Depending on where you live, you may have rights to access, correct or delete personal data we hold, or to object to certain processing. To exercise any of these rights, contact us.
Children's privacy
This site is intended for adults and does not knowingly collect any information from children under the age of 13.
Changes to this policy
We may update this Privacy Policy from time to time. Any changes will be posted on this page, and the date below will be updated.
Contact
If you have any questions about this Privacy Policy, please contact us.
Last updated: August 30, 2026