8 1/2 in MDSiZ716(215.9 mm)

Product ID: 66608A0201

Design Specifications

Total Cutters51
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(33) 16mm
Gauge Cutters(7) 16mm
Cone Cutters(4) 16mm
Back-Up Cutters(7) 13mm
Blade Count7
Nozzles7 Standard Series 50N
Bit Connection4 1/2 Reg
Junk Slot Area, in211.695
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 10.177 Overall: 14.365
Fishing NeckDiameter: 6 Length: 3.94

Operating Parameters

Bit SpeedSuitable for Motor and Rotary Steerable
Weight-on-Bit5,000 To 35,000 (lbs)
2,272 To 15,908 (daN)
2 To 16 (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 PX feature places thermally stable diamond inserts (TSP) on the gauge to maximize gauge retention and extend bit life.

The center location of the Stinger conical diamond in the bit enhances its stability to mitigate whirl and other artifacts that waste energy and reduce ROP. The Stinger element also provides an efficient mechanism to drill the very center of the borehole.

Low Exposure (MDOC – Managed Depth Of Cut) Cutter backing raised to minimize excessive depth of cut because of formation heterogeneity to reduce cutter loading and minimize torque in transitional drilling. Minimizes cutter breakage and extends bit life.