8 5/8 in MDSiR813(219.075 mm)

Product ID: 66379A0002 ER 26613

Design Specifications

Total Cutters89
Rolling Cutter Countn/a
Cutter Size13mm (1/2 in)
Face Cutters(39) 13mm
Gauge Cutters(8) 13mm
Cone Cutters(10) 13mm
Back-Up Cutters(32) 13mm
Blade Count8
Nozzles4 Standard Series 50N, 4 Standard 12 Fixed Port
Bit Connection4 1/2 Reg
Junk Slot Area, in27.204
GaugeLength: 3" Protection: Options Available
LengthMake-Up: 9.958 Overall: 14.146
Fishing NeckDiameter: 6 Length: 3.447

Operating Parameters

Bit SpeedRotary Steerable BHA
Weight-on-Bit18,000 To 35,000 (lbs)
8,181 To 15,908 (daN)
8 To 16 (Tonnes)
Flow Rate galUs/min325 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 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.

The PX feature places thermally stable diamond inserts (TSP) on the gauge to maximize gauge retention and extend bit life.

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.