Neftekamsk Machinery Plant
of Special Equipment
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Roller Kelly Bushing МК 200

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
Roller Kelly Bushing МК 200