The roller Kelly bushings
The roller Kelly bushings have two way of drive: the square drive and the pin drive. There are heavy, medium and light-duty according to type.
Main technical parameters:
|
Type |
Way of Drive |
Model |
Suitable for Kelly |
|
|
Square |
Hex. |
|||
|
Heavy |
Square Drive |
HDS |
21/2-6 |
3-6 |
|
Pin. Drive |
27-HDP |
3-6 |
3-6 |
|
|
20-HDP |
3-6 |
3-6 |
||
|
Medium |
Square Drive |
MDS |
2 1/2-4 1/4 |
3-4 1/4 |
|
M4 |
2 1/2-5 1/4 |
3-4 1/4 |
||
|
Pin. Drive |
20-MDP |
2 1/2-4 1/4 |
3-4 1/4 |
|
|
17-MDP |
2 1/2-4 1/4 |
3-4 1/4 |
||
|
Light-duty |
Square Drive |
S4 |
2 1/2-4 1/4 |
3-4 1/4 |
