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Technical Specifications


5 1/4 MC50

Diameter: 133.4mm (5 1/4")  
IADC Code: 512CY  
Design number: T204  
State standard designation: МЗ-ПН  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 0.25 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 93 (58/35)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 0
Connecting thread З-76 ук. (-)
Drill bit net weight, kg 6.60
Drill bit gross weight, kg 7.40

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 2.00-9.00 t (4400 - 19800 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.


The drill bit is designed for drilling soft abrasive formations

Design Features

Central and through the support purge air-water mixture

The shirttail and leg entering edge are hardfaced with tungsten carbide


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