Roller Kelly Bushings

The roller kelly bushings is one of the most important parts. The roller kelly bushings are designed to work together with the master bushing to reduce friction between the rollers and the rod and allow you to more accurately maintain the specified load on the bit. The roller kelly bushings is widely used in stationary or mobile drilling rigs specializing in rotary rotary drilling. The roller kelly bushings is designed and manufactured in accordance with API Spec 7K.

Technical Parameters for Roller Kelly Bushings

Model		HDS	27-HDP	20-HDP	MDS	20-MDP	17-MDP	LDS
Type		Heavy			Medium			Light
Max. Torque(tf)		32365			22555			13729
Drive way		Square drive	Pin drive		Square drive	Pin drive		Square drive
Permissible Drive Pipe Dimensions (inch)	Square, in	3~6			2 1/2~5 1/4			2 1/2~5 1/4
Permissible Drive Pipe Dimensions (inch)	Hex, in	3~6			3~4 1/4			3~4 1/4
Overall dimensions(mm)		630x630x740	630x630x780		493x493x696	510x510x720	458x458x700	508x508x700
Weight(kg)		700	730	670	420	460	340	400

The Roller Kelly Bushings has different models:

Roller kelly bushings type HD are an indispensable, replaceable, high-power device with a contact and square drive. The roller kelly bushings has the task of high-speed transmission of torque from the rotor to the upper working pipe with a square or hexagonal cross-section, as well as displacing oil from the collector of the drive pipe using the master bushing. The roller kelly bushings is made of a reliable cast housing with holes, made of wear-resistant metal. The roller kelly bushings can be installed in the master bushing in the shortest possible time. Fixation is carried out using four strong fingers.
Roller kelly bushings type MD are a replaceable medium-power device with a contact and square drive. Uses MD type roller kelly bushings to hold the rod and align with the master bushing, and to drive the rod using four rollers in the bushing, reducing friction as much as possible. The bushing installs easily into the drive pipe, maintaining good alignment.
Roller kelly bushings type SD is used on drilling rigs with rotary rotary drilling to transmit torque from the rotor table to the upper rod with square drive. The roller kelly bushings type SD is a replaceable low-power mechanism with a square drive from the rotor structure of the drilling rig. Roller kelly bushings type SD can reduce the level of friction between the rollers and the pipe.

Online consultation

Quick access to Technical Support and Detailed Quotations

Please fill out the form below so that we can quickly answer your questions and provide you with our high-quality technical support. You can also contact us through email, and our team will provide you with excellent service.