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Technical Specifications


8 1/2 MC60

Diameter: 215.9mm (8 1/2")  
IADC Code: 612CX  
Design number: T187C  
State standard designation: ТЗ-ПВ  


Gradient angle of axle journal 38°
Axle journal offset relative to drill bit axis 0.50 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 125 (82/43)
Total number of insert rows (inner/heel row) 12 (9/3)
Number of changeable nozzles 0
Connecting thread З-117 ук. (-)
Drill bit net weight, kg 35.00
Drill bit gross weight, kg 36.50

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 6.00-18.00 t (13200 - 39600 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 hard abrasive formations

Design Features


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