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Roller Kelly Bushings there are two ways of drive square drive and pin drive and three types heavy duty, mediumduty and light-duty. They are used for 17 1/2 to 49 1/2 inch rotary tables. They are designed and manufactured according to API Spec 7K Specification for drilling and well servicing equipment.
Roller Kelly Bushing is a necessary tool for drilling. It matches with master bushing to drive kelly pipe. when kelly pipe is drilling in. the rollers of the bushing favour the motion of kelly pipe and keep it concentric with well hole.
Roller Kelly Bushing HDS Heavy duty Square drive For Square Kelly size Square 2 1/2-6" and Hexagon kelly size 3”, 3 1/ 2”, 4 1/ 4”, 5 1/ 4”, 6”
The other roller kelly bushing available:
Roller Kelly Bushing 27-HDP Heavy duty Pin drive
Roller Kelly Bushing 20-HDP Heavy duty Pin drive
Roller Kelly Bushing 4KRVS Medium duty Square drive
Roller Kelly Bushing 20-MDP Medium duty Pin drive
Roller Kelly Bushing 17-MDP Medium duty Pin drive
Roller Kelly Bushing 4KRBM Light duty Square drive
