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Technical Specifications


5 3/8 T25 (MR50)

Diameter: 136.5mm (5 3/8")  
IADC Code: 513CY  
Design number: UT81  
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) 97 (63/34)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 0
Connecting thread 3-76 ук. (-)
Drill bit net weight, kg 7.10
Drill bit gross weight, kg 7.60

Recommended Drilling Conditions

Rotation speed 300-40 rpm
Thrust load 2.00-9.00 t (4400 - 19800 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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