The ABKB MODEL 27 PDHD OR 20 PDHD are developed as per API-7K specifications for pin drive master bushing for rotary table sizes from 27-1/2" to 49-1/2" having 25-3/4" and 23" dia pin center. This unit is used for heavy duty drilling operations and high torque conditions on off shore as well as on-shore drilling operations and handle Kelly sizes from 3" to 6" Square or Hexagonal. This unit will consist of the following: Kelly Bushings complete Wrench Wiper Assembly Wear gauge
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