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Technical Specifications


8 1/2 MC85

Diameter: 215.9mm (8 1/2")  
IADC Code: 832CZ  
Design number: T116  
State standard designation: ОК-ПВ  


Gradient angle of axle journal 38°
Axle journal offset relative to drill bit axis 1.00 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 148 (98/50)
Total number of insert rows (inner/heel row) 13 (10/3)
Number of changeable nozzles 0
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 35.00
Drill bit gross weight, kg 36.50

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 11.00-22.00 t (24200 - 48400 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 extra hard formations

Design Features


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