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Technical Specifications


14 3/4 RS30

Diameter: 374.6mm (14 3/4")  
IADC Code: 535X  
Design number: UT129  
State standard designation: МСЗ-ЦГВУ  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 7.00 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 192 (108/84)
Total number of insert rows (inner/heel row) 15 (12/3)
Number of changeable nozzles 4
Connecting thread З-177 (7 5/8 REG)
Drill bit net weight, kg 147.30
Drill bit gross weight, kg 151.70

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 16.00-26.00 t (35200 - 57200 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 soft abrasive formations with medium hard streaks

Design Features

Combined circulation (central and side), for which it is necessary to unscrew the screw from the central unit.

The leg shirttail and entering edge are hardfaced with tungsten carbide

Сarbide inserts on the back of the paw.

Tungsten carbide inserts on cone gage.


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