Kelly Bushing

Kelly Bushing
Kelly Bushing
Kelly Bushing
Kelly Bushing
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The kelly bushing is an indispensable device for petroleum drilling, and it is used to drive kelly with the help of a master bushing. It makes use of four rollers to reduce friction between itself and kelly so as to extend its service life, and the rollers can be changed to fit for square or hexagonal kelly.

Classification
1. According to drive method, our kelly bushing is divided into square drive kelly bushing and pin drive kelly bushing.

2. According to load capacity, our kelly bushing contains heavy duty kelly bushing, medium duty kelly bushing and light duty kelly bushing.

Application
The kelly drive bushing is designed and manufactured as per API Spec 7K, and it suits well for rotary tables ranging from 171/2 to 491/2inches.

Technical Data of Kelly Bushing
TypeDrive methodModelApplicable kelly size (inch)
SquareHexagonal
Heavy-dutySquare driveHDS21/2-63-6
Pin drive27-HDP3-63-6
20-HDP3-63-6
Medium-dutySquare driveMDS21/2-41/43-41/4
M421/2-51/43-41/4
Pin drive20-MDP21/2-41/43-41/4
17-MDP21/2-41/43-41/4
Light-dutySquare driveS421/2-41/43-41/4
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