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Technical Specifications


12 1/4 M75

Diameter: 311.1mm (12 1/4")  
IADC Code: 742Y  
Design number: T231  
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) 193 (135/58)
Total number of insert rows (inner/heel row) 15 (12/3)
Number of changeable nozzles 3
Connecting thread З-152 (6 5/8 REG)
Drill bit net weight, kg 98.00
Drill bit gross weight, kg 100.80

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 14.00-28.00 t (30800 - 61600 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 hard formations

Design Features

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

The leg shirttail and entering edge are hardfaced with tungsten carbide

The leg is protected with tungsten carbide inserts

Tungsten carbide inserts on cone gage


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