API oil equipment Square Drive Roller Kelly Bushing

1.lower wear , long life ,friction lower,weight accurate 2.can't fly out and hurt you 3.high qulity and conpetitive price Square Drive Roller Kelly Bushing    The Square Drive Roller Kelly Bushing provides the following advantages:     1.Pulling out or feeding off string can be done while rotating;    2.Because of its whole construction, it can no  fly out and hurts you.    3.The bushing is easily installed into the master bushing, maintaining good alignment;    4.The contact between Kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate;    5.The Kelly has lower wear and has long life;

 

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Kelly Size		Bottom seat (mm)
Inch	mm	Opposite side	Large end of the taper	Taper
3-1/2	88.9	332(ZP520 rotary table)342(MR17.5 rotary table)	330(ZP520 rotary table)332(MR17.5 rotary table)	1:3
4-1/4	107.95
5-1/4	133.35
4-1/2	115	332	330	1:3
		(ZP520 rotary table)	(ZP520 rotary table)

API oil equipment Square Drive Roller Kelly Bushing