8 1/2 in MDSiZ516(215.9 mm)

Product ID: 66731A0001

Design Specifications

Total Cutters47
Cutter Size16mm (5/8 in)
Face Cutters(21) 16mm
Gauge Cutters(5) 16mm
Cone Cutters(5) 16mm
Back-Up Cutters(16) 16mm
Total Stinger Element Count1
Blade Count5
Nozzles5 Standard Series 60N
Bit Connection4 1/2 Reg
Junk Slot Area, in215.664
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 9.486 Overall: 13.674
Fishing NeckDiameter: 6.38 Length: 3.855

Operating Parameters

Bit SpeedRotary Steerable BHA and Downhole
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 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.