Drilling Drag Type (DDT)


The HOC Drilling Drag Type Underreamer is designed to have a larger expansion ratio for milder applications that require circulation through the tool.

Features and Benefits:

  • Designed with the piston and actuator as a single component.
  • The tool operates with minimal moving parts.
  • Cutters actuate in a scissor motion.
  • Hydraulically expandable with pump pressure.
  • Reverse jetting actuation assures a full gauge hole and increased cutter cleaning and life.
  • The DDT is designed to utilize PDC or HOC’s ADD cutters.


DDT Specifications


Call For More Information   Request a Quote


Looking for more information or specific tool spec sheets? Contact us today for more information!