Specifications

Roller Kelly Bushing:
1.drive:square and pin
2.API Spec.7K
3.used for 17 1/2" ~ 49 1/2" rotary tables

Roller Kelly Bushing

 

     

 

 

    1.Pulling out or feeding off string can be done while rotating;

    2.Because of its integral construction, it cannot fly out and hurts you.

    3.The bushing is easily installed into the master bushing, maintaining good alignment;

    4.The contact between Kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate;

    5.The Kelly has lower wear and has long life.

 

Model	Type	Way of Drive	Suitable for Kelly
			Square(in)	Hexagon(in)
HDS	Heavy	Square drive	3-6	3-6
27-HDP		Pin drive	3-6	3-6
20-HDP		Pin drive	3-6	3-6
RTM4	Medium	Square drive	2 1/2-5 1/4	3-4 1/4
20-MDP		Pin drive	2 1/2-4 1/4	3-4 1/4
17-MDP		Pin drive	2 1/2-4 1/4	3-4 1/4
RTS4	Light-dury	Square drive	2 1/2-4 1/4	3-4 1/