Specifications

1. API SPEC 7K Standard
2. Matches with the master bushing to drive the kelly
3. Square drive and pin drive two forms

Standard: API SPEC 7K Standard

 

Function:

This king of bushing is the necessary product of drilling rig. It matches with the master bushing to drive the kelly. This product rotates the kelly through four rollers to reduce the friction thus extend its working life.

 

Usage:

This product has square drive and pin drive two forms. It can match with different type of kelly by changing the rollers. Our rotary bushing can interchange with production of National, Oilwelll, Emsco, Ideco, Gardner etc company.

 

Detailed specification: 

Technical specification and parameters for Roller bushing
Type	Mode	Type of drive	Kelly size
			Square Kelly(in)	Hex. Kelly (in)
HDS	Heavy type	Square	3”~6”	3”~6”
21-HDP		Pin	3”~6”	3”~6”
20-HDP		Pin	3”~6”	3”~6”
RTM4	Medium type	Square	2 1/2”~5 1/4”	3 “~4 1/4”
20-MDP		Pin	2 1/2”~4 1/4”	3 “~4 1/4”
17-MDP		Pin	2 1/2”~4 1/4”	3 “~4 1/4”
RTS4	Light weight type	Square	2 1/2”~4 1/4”	3 “~4 1/4”