8 1/2 in FHKi40(215.9 mm)

Product ID: 0061059010 ER 8258 IADC 617X

Design Specifications

Bearing TypeSpinodal™ 2 Bearing w/Silver Plated Components
Seal TypeDual Material Bullet Seals
Bit Connection Type4 1/2 Reg
Journal Angle (°)36
Offset (inches)0.125
RowsTotal: 15 Inner: 12 Gage: 3
Inserts/TeethTotal: 156 Inner: 114 Gage: 42

Operating Parameters

Weight on Bit20,000 To 55,000 (lbs)
9,090 To 24,998 (daN)
9 To 25 (Tonnes)
Rotary Speed (RPM)50 To 250
The operating parameters listed here are general parameters, please contact your local Smith Bits representative for precise recommendations for your individual well.



Binary carbide gauge places wear resistant semi-round top carbide inserts between the primary gauge inserts to enhance gauge retention in transitional drilling. This substantially improves gauge durability and allows longer in-gauge bit runs.

Diamond enhanced heel inserts maintain gauge in abrasive, hard formation drilling and significantly increase cone durability. This feature extends bit life and ensures that a full gauge hole is drilled.

Spinodal 2 bearing with silver plated components ensures longer runs at higher ROP. This proprietary material offers maximum wear resistance and withstands extreme load forces for longer periods than conventional bearing materials.