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Technical Specifications

 

9 7/8 M85

Diameter: 250.8mm (9 7/8")  
IADC Code: 832Z  
Design number: T401M  
State standard designation: ОК-ПГВ  
 

Specification

Gradient angle of axle journal 38°
Axle journal offset relative to drill bit axis 1.00 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 174 (121/53)
Total number of insert rows (inner/heel row) 14 (11/3)
Number of changeable nozzles 3
Connecting thread З-121 ук. (-)
Drill bit net weight, kg 49.50
Drill bit gross weight, kg 51.00
 

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 12.00-24.00 t (26400 - 52800 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.
 

Purpose

The drill bit is designed for drilling extra hard formations
 

Design Features









 

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