HDP Roller Kelly Bushing is heavy type, suitable to square drive.They are designed and manufactured according to API Spec 7K Specification for drilling and well servicing equipment.
Model |
Applicable Size of Kelly(in) |
Drive Way |
Master Bushing |
|
20HDP |
Square（SQ） |
2.1/2-6 |
|
20.1/2-22.1/2 |
Hex（HE） |
3-6 |
|||
27HDP |
Square（SQ） |
2.1/2-6 |
23-49.1/2 |
|