8 1/2 in R516(215.9 mm)

Product ID: 66873A0001 ER 26970

Design Specifications

Total Cutters46
Rolling Cutter Count9
Cutter Size16mm (5/8 in)
Face Cutters(19) 16mm
Gauge Cutters(5) 16mm
Cone Cutters(6) 16mm
Back-Up Cutters(16) 16mm
Blade Count5
Nozzles5 Standard Series 50N
Bit Connection4 1/2 Reg
Junk Slot Area, in215.104
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 9.979 Overall: 14.167
Fishing NeckDiameter: 6 Length: 4.263

Operating Parameters

Bit SpeedDesigned for use on steerable motor
Weight-on-Bit18,000 To 32,000 (lbs)
8,181 To 14,544 (daN)
8 To 14 (Tonnes)
Flow Rate galUs/min500 To 600
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 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 advanced ONYX cutter technology. This includes the next generation ONYX II cutters that have superior abrasive wear and exceptional resistance to thermal degradation, enhancing cutter durability for increased footage drilled and faster ROP.