Terms of Use
By using MachinistData, you agree to these terms. Please read them. They are straightforward: this is a free reference site, and the data is provided as-is for information purposes.
Acceptance of terms
By accessing or using this site, you accept and agree to be bound by these Terms of Use. If you do not agree, please do not use the site.
Reference data, not engineering advice
The tap drill sizes, charts and calculators on this site are provided for reference and general information only. They are not a substitute for professional engineering judgment, and they do not constitute engineering advice or a guarantee of outcome.
Always verify tap drill sizes against the relevant thread standard and the manufacturer's specification for your specific material, tooling and application. Incorrect drill sizing can lead to broken taps, stripped threads or part failure.
No warranty
The site and its content are provided on an "as is" and "as available" basis. We make no warranties, express or implied, about the accuracy, completeness, reliability or fitness for a particular purpose of the information provided.
To the maximum extent permitted by law, MachinistData, its operators and contributors shall not be liable for any direct, indirect, incidental or consequential loss or damage arising from your use of, or reliance on, the information on this site.
Acceptable use
You agree not to misuse the site, including by attempting to gain unauthorised access, disrupting the service, or using the content in a way that is unlawful or infringes the rights of others.
Intellectual property
Unless stated otherwise, the content on this site — including the charts, text and original reference data — is owned by or licensed to MachinistData. You may use it for personal, non-commercial reference. Commercial reproduction or redistribution requires permission.
Third-party advertising
This site displays third-party advertising. The content of any advertisements is the responsibility of the respective advertiser, and the presence of an ad does not constitute an endorsement.
Changes to these terms
We may update these Terms of Use from time to time. Continued use of the site after changes are posted indicates acceptance of the revised terms.
Contact
If you have questions about these Terms of Use, please contact us.
Last updated: August 30, 2026