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Technical Specifications


8 1/2 RS35

Diameter: 215.9mm (8 1/2")  
IADC Code: 545X  
Design number: UT370  
State standard designation: СЗ-ЦГВУ  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 4.80 mm
Bearing type Roller bearing
Sealing Elastomer
Total number of inserts (inner/heel row) 121 (81/40)
Total number of insert rows (inner/heel row) 12 (9/3)
Number of changeable nozzles 4
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 39.00
Drill bit gross weight, kg 40.50

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 7.00-16.00 t (15400 - 35200 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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