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 Kelly bushing
Type	Mode	Max. torque (N.m)	Type of drive	Kelly size
				Square Kelly(in)	Hex. Kelly (in)
HDS	Heavy type	27000	Square	3”~6”	3”~6”
20-HDP		32340	Pin	3”~6”	3”~6”
27-HDP			Pin	3”~6”	3”~6”
MDS	Medium type	22540	Square	2 1/2”~5 1/4”	3 “~4 1/4”
17-MDP			Pin	2 1/2”~4 1/4”	3 “~4 1/4”
20-MDP			Pin	2 1/2”~4 1/4”	3 “~4 1/4”
LDS	Light weight type	13720	Square	2 1/2”~4 1/4”	3 “~4 1/4”