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Technical Specifications


9 5/8 M85

Diameter: 244.5mm (9 5/8")  
IADC Code: 832Z  
Design number: T481M  
State standard designation: ОК-ПГВ  


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) 174 (121/53)
Total number of insert rows (inner/heel row) 14 (11/3)
Number of changeable nozzles 3
Connecting thread З-121 ук. (-)
Drill bit net weight, kg 49.50
Drill bit gross weight, kg 51.90

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 12.00-24.00 t (26400 - 52800 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

The leg shirttail and entering edge are hardfaced with tungsten carbide.

The leg entering edge is protected with tungsten carbide inserts

Side and bearing circulation of the borehole bottom with air and water mixture


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