RTM4 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 |
|
RTM4 |
Square（SQ） |
2.1/2-5.1/4 |
Square drive |
17.1/2-271/2 |
Hex（HE） |
3-4.1/4 |
|||