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Technical Specifications


7 7/8 M70

Diameter: 200.0mm (7 7/8")  
IADC Code: 722Y  
Design number: T201  
State standard designation: К-ПГВ  


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) 123 (80/43)
Total number of insert rows (inner/heel row) 12 (9/3)
Number of changeable nozzles 3
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 32.80
Drill bit gross weight, kg 34.30

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 9.00-18.00 t (19800 - 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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