18 1/2 in MDSiR816(469.9 mm)

Product ID: 66733A0001 ER 26886

Design Specifications

Total Cutters198
Rolling Cutter Countn/a
Cutter Size16mm (5/8 in)
Face Cutters(78) 16mm
Gauge Cutters(8) 16mm
Cone Cutters(28) 16mm
Back-Up Cutters(84) 16mm
Blade Count8
Nozzles12 Standard Series 60N
Bit Connection7 5/8 Reg
Junk Slot Area, in268.361
GaugeLength: 5" Protection: Options Available
LengthMake-Up: 15.855 Overall: 21.043
Fishing NeckDiameter: 5 Length: 3.393

Operating Parameters

Bit SpeedRotary Steerable BHA & Downhole Motors
Weight-on-Bit8,000 To 40,000 (lbs)
3,636 To 18,180 (daN)
4 To 18 (Tonnes)
Flow Rate galUs/min700 To 1450
Hydraulic Horsepower, HSI1 To 6
Recommended Make-up Torque61,850 To 79,800 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 PX feature places thermally stable diamond inserts (TSP) on the gauge to maximize gauge retention and extend bit life.

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.

Bit design is available with RockStorm PDC technology. These all-in-one cutters break the paradigm and provide ultimate wear resistance and ultimate impact resistance in the same PDC cutter. As a result, faster drilling rates are delivered while increasing overall run length.

Increased cleaning, cooling, and cuttings evacuation with available hydraulic flows; high flow rates with minimal increase in pump pressure, and reduced risk a bit balling.