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Technical Specifications


8 1/2 R35

Diameter: 215.9mm (8 1/2")  
IADC Code: 543X  
Design number: UT02  
State standard designation: СЗ-ГВ  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 4.80 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 139 (95/44)
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 40.00
Drill bit gross weight, kg 41.50

Recommended Drilling Conditions

Rotation speed 600-40 rpm
Thrust load 9.00-19.00 t (19800 - 41800 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 abrasive formations

Design Features


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