: Some technical service providers host reference copies for internal training, like this 2018 Specification Draft . API Spec 6A Most Recent - Accuris Standards Store
The is the latest major revision, and it brings the industry into a new era of modern material science and manufacturing technology. api specification 6a 21st edition pdf link
: For the first time, sizing tables exist in full sets for both SI (metric) and USC (imperial) units, eliminating rounding errors and confusion. Cons: Compliance Challenges : Some technical service providers host reference copies
API Specification 6A, 21st Edition - American Petroleum Institute Cons: Compliance Challenges API Specification 6A
Official notifications and these free supplements can be found at the API Monogram/APIQR Program Updates page. Unofficial Community Previews
I’m unable to provide a direct PDF link or copy of the due to copyright restrictions. This document is commercially published by the American Petroleum Institute (API) and must be purchased through their authorized platform (IHS Markit, Techstreet, or the API Publications store).