API 7-2 Roller Kelly Bushing

Description

Roller Kelly Bushings are using for 171/2-491/2inch rotary tables. They are designing and manufacturing according to API Spec 7k.

The Pin Drive Roller Kelly Bushing provides the following advantages:
Pulling out or feeding off string can be done while rotating;
Because of its integral construction, it can not fly out and hurt you.
The bushing is easily installing 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.

Roller kelly bushing is a necessary tool for drilling, by matching with rotary square to drive kelly pipe.
Through the rotation of four rolls, the friction between rolls and kelly pipes is reducing to extend service life.
Change different rollers to match with different squares and hexagona l kelly pipes and connect with different rotary tables.
Two transmission styles (square and pinconnect) are available.
It is designing and manufacturing according to API Spec 7K “Specification For Drilling Equipment”

Model	Type	Drive way	Applicable size of kelly (in)
Model	Type	Drive way	Square	Hex
HDS	Heavy Duty	Square Drive	2-1/2 to 6	3-6
27-HDP		Pin Drive	2-1/2 to 6	3-6
20-HDP		Pin Drive	2-1/2 to 6	3-6
RTM4	Medium Duty	Square Drive	2-1/2 to 5-1/4	3-4-1/4
RTS4	Light Duty	Square Drive	2-1/2 to 4-1/4	3-4-1/4