8 1/2 in MDSiZ519(215.9 mm)

Product ID: 66361A0001 ER 26598

Design Specifications

Total Cutters31
Cutter Size19mm (3/4 in)
Face Cutters(14) 19mm
Gauge Cutters(5) 19mm
Cone Cutters(4) 19mm
Back-Up Cutters(8) 19mm
Blade Count5
Nozzles5 Standard Series 60N
Bit Connectionn/a
Junk Slot Area, in212.887
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 8.897 Overall: 13085
Fishing NeckDiameter: 6 Length: 3.643

Operating Parameters

Bit SpeedSteerable PDM's
Weight-on-Bit5,000 To 30,000 (lbs)
2,272 To 13,635 (daN)
2 To 14 (Tonnes)
Flow Rate galUs/min480 To 650
Hydraulic Horsepower, HSI1 To 6
Recommended Make-up Torque16600 To 21600 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.

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.

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.

The Stinger element features a highly distinctive conical geometry with a thick synthetic diamond layer, engineered to resist high impact loads and abrasive wear for superior durability.