Threaded and Coupled connections are designed to perform at 100% of the tubular body strength. They use the original tubular geometry and employ a larger diameter coupling to ensure connection strength.
Semi-Premium Threaded and Coupled connections have no metal-to-metal seals within their design. Designs use either proprietary or API compatible thread forms.
Designed for enhanced torque versus standard API connections, their designs vary depending on coupling design.
Premium Threaded and Coupled connections use metal-to-metal seals within their design to ensure both liquid and gas sealability. Most use proprietary thread forms to enhance both the tension and compression efficiencies.