API petroleum machinery Series of Roller Kelly Bushings

The product can reduce its friction with Kelly by rotation of four rollers and extend its service life .

Series of Roller Kelly Bushings

The Roller Kelly bushing ia 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 .Two transmission styles(square and pinconnect)are available.The product is designed and manufactured according to API Spec 7k”Specification for Drill Equipment”.

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Model		HDS	27-HDP	20-HDP	MDS	20-MDP	17-MDP	LDS
Type		Heavy			Medium			Light
Max. torque	N.m	32365			22555			13729
	ft.lbf	23871			16636			10126
Drive Mode		Square	Pin		Square	Pin		Square
Square	mm	76.2∼152.4			63.5∼133.35			63.5∼133.35
	in	3∼6			21/2∼51/4			21/2∼51/4
Hex	mm	76.2∼152.4			76.2∼107.95			76.2∼107.95
	in	3∼6			3∼41/4			3∼41/4
Size	mm	630*630*740	630*630*780		493*493*696	510*510*720	458*458*700	508*508*700
	in	24.8*24.8*29.1	24.8*24.8*30.7		19.4*19.4*27.4	20*20*28.3	18*18*27.5	20*20*27.5
Weight	Kg	700	730	670	420	460	340	400
	lb	1540	1610	1470	924	1012	750	808

API petroleum machinery Series of Roller Kelly Bushings