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Technical Specifications


3 7/8 T25

Diameter: 98.4mm (3 7/8")  
IADC Code: 521CY  
Design number: UT97  
State standard designation: МЗ-ЦН  


Gradient angle of axle journal 33°
Axle journal offset relative to drill bit axis 0.25 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 76 (47/29)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 0
Connecting thread З-66 ук. (-)
Drill bit net weight, kg 3.60
Drill bit gross weight, kg 4.10

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 3.00-8.00 t (6600 - 17600 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.



Design Features


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