RTM4 Roller Kelly Bushing

API Spec 7K Roller Kelly BushingRoller Kelly bushing is a necessary tool for drilling, by matching with rotary square to drive Kelly pipe.

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Roller Kelly bushing is a necessary tool for drilling, by matching with rotary square to drive Kelly pipe. Through the rotation of four rolls, the friction between rolls and Kelly pipes is reduced to extend service life. Change different rollers to match with different squares and hexagonal Kelly pipes and connect with different rotary tables. Two transmission styles (square and pin drive) are available. The product is designed and manufactured according to API Spec 7K.

Model Type Drive way applicable size of kelly(in)
Square Hex
HDS Heavy duty Square drive 2 1/2″-6″ 3″-6″
27-HDP Pin drive 2 1/2″-6″ 3″-6″
20-HDP 3″-6″
RTM4 Medium duty Square drive 2 1/2″-5 1/4″ 3″-4 1/4″
RTS4 Light duty 2 1/2″-4 1/4″ 3”-4 1/4″

 

 

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