12 1/4 in Z816(311.15 mm)

Product ID: 66571A0001 ER 26769

Design Specifications

Total Cutters44
Total Stinger Element Count78
Stinger Element Size9/16 in
Cutter Size16mm (5/8 in)
Face Cutters(20) 16mm
Gauge Cutters(8) 16mm
Cone Cutters(8) 16mm
Back-Up Cutters(8) 16mm
Blade Count8
Nozzles12 Standard Series 60N
Bit Connection6 5/8 Reg
Junk Slot Area, in223.603
GaugeLength: 5" Protection: Options Available
LengthMake-Up: 13.244 in Overall: 18.182 in
Fishing NeckDiameter: 8 in Length: 3.521 in

Operating Parameters

Bit Speed140 To 300 RPM
Weight-on-Bit4,000 To 50,000 (lbs)
1,818 To 22,725 (daN)
2 To 22 (Tonnes)
Flow Rate galUs/min500 To 1000
Hydraulic Horsepower, HSI1 To 6
Recommended Make-up Torque47300 To 47800 pound ft
The operating parameters listed here are general parameters, please contact your local Smith Bits representative for precise recommendations for your individual well.



Bit design and performance have been certified through the validation process prescribed by IDEAS simulation technology.

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.

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.

Bit design is available with RockStorm PDC technology. These all-in-one cutters break the paradigm and provide ultimate wear resistance and ultimate impact resistance in the same PDC cutter. As a result, faster drilling rates are delivered while increasing overall run length.