The Roller Kelly Bushing is a necessary tool for 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".

Technical Specifications Model Type Max Torque N.m Drive Mode Size Range of Kelly(in) Square Hexagon HDS Heavy-duty 27000 Square 3~6 3~6 20-HDP 32340 Pin 3~6 3~6 27-HDP Pin 3~6 3~6 MDS Medium-duty 22540 Square 2 1/2 ~ 5 1/4 3~4 1/4 17-MDP Pin 2 1/2 ~ 5 1/4 3~4 1/4 20-MDP Pin 2 1/2 ~ 5 1/4 3~4 1/4 LDS Light-duty 13720 Square 2 1/2 ~ 5 1/4 3~4 1/4 Note: Model 27-HDP is equal to original GBX-62; Model HDS is equal to original GBX-6.