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Technical Specifications

 

3 7/8 MC30

Diameter: 98.4mm (3 7/8")  
IADC Code: 312C  
Design number: T44  
State standard designation: Т-ПН  
 

Specification

Gradient angle of axle journal 36°
Axle journal offset relative to drill bit axis 0.50 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 63 (29/34)
Total number of insert rows (inner/heel row) 7 (4/3)
Number of changeable nozzles 0
Connecting thread 3-66 ук. (-)
Drill bit net weight, kg 3.70
Drill bit gross weight, kg 4.20
 

Recommended Drilling Conditions

Rotation speed 115-60 rpm
Thrust load 4.00-8.00 t (8800 - 17600 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.
 

Purpose

 

Design Features









 

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