This external torque shoulder ensures the pin and box are exactly positioned and allows the application of more-than-adequate torque to prevent downhole backoff. The 300 shoulder surface also creates a pressure seal capable of resisting the API internal pressure rating of the pipe.

This shoulder performs as an additional torque shoulder, storing a small amount of torque and helping to prevent overmakeup.

This nontapered, noninterference thread form minimizes galling and thread-generated stresses.

This seal element is created by radial interference and is capable of resisting the API internal pressure rating the pipe. The 140 angle minimizes rubbing between the elements, which minimizes the possibility of galling and wear.

This connector is machined on a streamlined upset for extra clearance. The ID of the pin end is cold formed prior to machining and is machine bored to pass API drift.