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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.



Design Features


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