8 1/2 in MDSiR616(215.9 mm)

Product ID: 66595A0001 ER 26792

Design Specifications

Total Cutters65
Rolling Cutter Count14
Cutter Size16mm (5/8 in)
Face Cutters(28) 16mm
Gauge Cutters(6) 16mm
Cone Cutters(7) 16mm
Back-Up Cutters(24) 16mm
Blade Count6
Nozzles6 Standard Series 60N
Bit Connection4 1/2 Reg
Junk Slot Area, in212.537
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 9.769 Overall: 13.957
Fishing NeckDiameter: 2 Length: 3.953

Operating Parameters

Bit SpeedRotary Speed Rotary Steerable BHA & Downhole Motors
Weight-on-Bit4,000 To 30,000 (lbs)
1,818 To 13,635 (daN)
2 To 14 (Tonnes)
Flow Rate galUs/min300 To 800
Hydraulic Horsepower, HSI1 To 6
Recommended Make-up Torque16,600 To 21,600 pound ft
The operating parameters listed here are general parameters, please contact your local Smith Bits representative for precise recommendations for your individual well.



The ONYX 360 rolling cutter feature allows the PDC element to rotate enabling the full circumference of the diamond edge to be utilized. This prevents a wear flat developing in only one place thereby maintaining cutter sharpness for improved drillbit durability.

The PX feature places thermally stable diamond inserts (TSP) on the gauge to maximize gauge retention and extend bit life.