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Roller Kelly Bushings are used for 171/2-491/2inch rotary tables. They are designed and manufactured according to API Space 7k. The Pin Drive Roller Kelly Bushing porvides the following advantages:Pulling out or feeding off string can be done while rotating;Because of its intergral construction,Website:://.snrle.com, it can not fly out and hurt you.The bushing is easily installed into the master bushing, maintaining good alignment;The contact between Kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate. 1. Roller kelly bushing is a necessary tool for drilling, by matching with rotary square to drive kelly pipe.2. Through the rotation of four rolls, the friction between rolls and kelly pipes is reduced to extend service life.3. Change different rollers to match with different squares and hexagona l kelly pipes and connect with different rotary tables.4.Two transmission styles (square and pinconnect) are available.5.It is designed and manufactured according to API Spec 7K "Specification For Drilling Equipment"
