 Home > Products > Drilling Equipment > Roller Kelly Bushing
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Roller Kelly Bushing
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 reduced to extend service life. Change different rollers to match
with different squares and hexagonal kelly pipes and connect with different rotary
tables. Two transmission styles (square and pin-connect) are available.
The product is designed and manufactured according to API Spec 7K "Specification
for Drill Equipment".
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 Specifications:
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Model
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Type
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Max. torque N.m
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Drive mode
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Size range of Kelly (in)
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Square
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Hexagon
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HDS
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Heavy-duty
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27000
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Square
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3-6
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3-6
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20-HDP
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32340
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Pin
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3-6
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3-6
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27-HDP
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Pin
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3-6
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3-6
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MDS
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Medium-duty
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22540
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Square
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21/2-51/4
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3-41/4
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17-MDP
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Pin
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21/2-41/4
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3-41/4
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20-MDP
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Pin
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21/2-41/4
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3-41/4
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LDS
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Light-duty
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13720
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Square
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21/2-41/4
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3-41/4
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Note: Model 27-HDP is equal to original GBX-6Z; Model HDS is equal to original GBX-6.
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