The New public API Double-Shouldered Connection Standard: Torque Equations and Practical Implementation

API's new double-shouldered connection standard delivers higher torque capacity through stress distribution across two shoulders. But the new equations differ fundamentally from single-shouldered methodology, interchangeability creates operational risks, and combined loading mechanics determine actual performance limits. 

This whitepaper covers the torque calculation framework, stress distribution principles, interchangeability rules, and design envelope analysis you need to specify and operate these connections safely.