8 3/8 in ZR813(212.725 mm)

Product ID: 67120A0001

Design Specifications

Total Cutters66
Total Stinger Element Count23
Stinger Element Size9/16 in
Rolling Cutter Count14
Cutter Size13mm (1/2 in)
Face Cutters(35) 13mm
Gauge Cutters(10) 13mm
Cone Cutters(10) 13mm
Back-Up Cutters(11) 13mm
Blade Count8
Nozzles4 Standard Series 50N, 4 Standard 12 Fixed Port
Bit Connection4 1/2 Reg
Junk Slot Area, in27.298
GaugeLength: 3" Protection: Options Available
LengthMake-Up: 10.37 in Overall: 14.558 in
Fishing NeckDiameter: 6 in Length: 3.698 in

Operating Parameters

Bit Speed140 To 300 RPM
Weight-on-Bit5,000 To 45,000 (lbs)
2,272 To 20,452 (daN)
2 To 20 (Tonnes)
Flow Rate galUs/min300 To 800
Hydraulic Horsepower, HSI1 To 6
Recommended Make-up Torque47,300 To 47,800 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 Stinger's unique conical geometry delivers high point loading to fracture tough-to-drill formations more efficiently.

Placed on the blade, Stinger conical diamond elements offer improved impact resistance when drilling through inter-bedded formations or when hard inclusions such as chert or conglomerates are encountered.

Bit design is available with FireStorm PDC technology. These all-in-one cutters provide best-in-class impact and abrasion resistance. As a result, faster drilling rates are delivered while increasing overall run lengths.

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.

Placing thermally stable diamond inserts (TSP) on the gauge maximizes gauge retention and extends bit life.