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Technical Specifications


5 7/8 T4

Diameter: 149.2mm (5 7/8")  
IADC Code: 211C  
Design number: UT121  
State standard designation: С-ЦН  


Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 2.00 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 68 (31/37)
Total number of insert rows (inner/heel row) 7 (4/3)
Number of changeable nozzles 0
Connecting thread З-88 (3 1/2 REG)
Drill bit net weight, kg 10.60
Drill bit gross weight, kg 11.40

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 5.00-12.00 t (11000 - 26400 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 medium hard formations

Design Features


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