Roller kelly bushing is designed for torque transmission from rotary table to kelly bar.
Kelly bushing can be used with different unit sizes of kelly bars.
- Wear-resistant alloy steel is used in manufacturing of rollers.
- Rollers have sleeve bearings and high tenacity synthetic material plates which ensure a longer operating life comparing to usual bearing parts, thus jamming of rollers is impossible.
- Increased torque moment comparing to the Russian analogues.
When changing the unit sizes of kelly bar, the following is replaced:
- rollers (roller diameter is changed);
- pipe wiper (square aperture size is changed);
- square sectors (square aperture size is changed);
Technical Specifications
Roller kelly bushing marking |
МК200.00.00.000-20 |
Design size of kelly stem*, mm |
80 |
89 |
108 |
112 |
133 |
140 |
155 |
Torque moment, kNxm |
50 |
Overall dimensions, max., mm |
Ø 600 х 832 |
Mass, max., kg |
640 |