1. Product Descriptions:

the Roller Kelly bushing is a necessary tool tor drilling,by matching with the rotary square to drive Kelly pipe.the product can reduce its friction with Kelly by rotation of four rollers and extend its service life. Change different rollers to match with different square and hexagonal Kelly pipes and connect with different rotary tables.

 

Roller Kelly Bushings can be classed as two types based on different ways of drive, square drive and pin drive. Also they can be classed as three types based on different style, heavy, medium 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.

2. Technical Parameters:

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			2 1/2-6	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