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Technical Specifications


8 1/2 MC10

Diameter: 215.9mm (8 1/2")  
IADC Code: 122C  
Design number: T142  
State standard designation: М-ПВ  


Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 0.50 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 85 (40/45)
Total number of insert rows (inner/heel row) 8 (5/3)
Number of changeable nozzles 0
Connecting thread 3-117 ук. (-)
Drill bit net weight, kg 32.00
Drill bit gross weight, kg 33.50

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 3.00-13.00 t (6600 - 28600 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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