Kelly Bushing

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HDP Roller Kelly Bushing
HDS Roller Kelly Bushing
M4 Roller Kelly Bushing
S4 Roller Kelly Bushing

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

Type	Drive method	Model	Applicable kelly size (inch)
Type	Drive method	Model	Square	Hexagonal
Heavy-duty	Square drive	HDS	2¹/₂-6	3-6
	Pin drive	27-HDP	3-6	3-6
	Pin drive	20-HDP	3-6	3-6
Medium-duty	Square drive	MDS	2¹/₂-4¹/₄	3-4¹/₄
	Square drive	M4	2¹/₂-5¹/₄	3-4¹/₄
	Pin drive	20-MDP	2¹/₂-4¹/₄	3-4¹/₄
	Pin drive	17-MDP	2¹/₂-4¹/₄	3-4¹/₄
Light-duty	Square drive	S4	2¹/₂-4¹/₄	3-4¹/₄