8 3/8 in MDSiZ616(212.725 mm)

Product ID: 66437A0001 ER 26669

Design Specifications

Total Cutters44
Cutter Size16mm (5/8 in), 19mm (3/4 in)
Face Cutters(13) 16mm, (5) 19mm
Gauge Cutters(7) 16mm
Cone Cutters(6) 19mm
Back-Up Cutters(13) 16mm
Total Stinger Element Count1
Blade Count6
Nozzles6 Standard Series 60N
Bit Connection4 1/2 Reg
Junk Slot Area, in212.964
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 8.862 Overall: 13.05
Fishing NeckDiameter: 6 Length: 6.68

Operating Parameters

Bit SpeedSuitable for Rotary, Steerable Motor & BHA
Weight-on-Bit3,500 To 30,000 (lbs)
1,591 To 13,635 (daN)
2 To 14 (Tonnes)
Flow Rate galUs/min300 To 650
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.

Bit design is available with ONYX fixed cutters for improved thermal stability in harder, more abrasive formations, resulting in greater wear resistance.

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.