GB CDE Drilling with Casing Connection
CDE – Casing Drilling Enhanced

Connection Data Sheet Generator

US Patent 7,347,459


Running Standard downhole casing applications

Rotating To aid string advancement

Drilling with Casing / Drilling with Liners


For use in non-abrasive environments


Specialty semi-premium connection machined from heavy-wall coupling stock and forged blanks. The GB CDE Connection performances exceed that of standard API connections. Connections are designed with refined API BTC Threads and will make up with off-the-shelf API BTC threaded accessories. Innovative, triple taper thread design (box only) reduces localized bearing stresses in critical areas for improved fatigue resistance. Pin noses engage shoulders in the coupling center for positive indication of proper field makeup. Pin noses, designed for maximum bearing face area, provide high torque resistance


  • Uses API BTC Pin Threads (Slightly Modified).
  • Tighter diametric tolerances for enhanced performance.
  • Meets API Coupling OD and Drift Diameter Specifications.
  • Inter-changeable with API BTC accessories.
  • Field proven in a variety of static and dynamic applications.
  • Enhanced fatigue life.
  • Excellent make/break repeatability under field conditions.
  • Full Scale laboratory cyclic tests demonstrate enhanced fatigue life.
  • Can be inspected with standard API Thread Gauges by any properly trained/experienced Third Party.
  • Positive makeup indication with pin nose engagement in center of connection. Also, has API Triangle Stamp on Pin for secondary makeup verification.
  • Innovative Triple Taper Design reduces localized bearing stresses for enhanced fatigue resistance and reduced galling potential.
  • Integral, Sacrificial Wear Sleeve on Leading Edge.
  • High Torque resistance.
  • Drive-able.


  • Casing sizes 4 1/2" OD to 20" OD.
  • All standard casing grades up to Q-125.