12 1/4 in MSiZ519(311.15 mm)

Product ID: 66271A0001 ER 26521

Design Specifications

Total Cutters61
Cutter Size16mm (5/8 in), 19mm (3/4 in)
Face Cutters(21) 19mm
Gauge Cutters(10) 16mm
Cone Cutters(10) 19mm
Back-Up Cutters(20) 16mm
Blade Count5
Nozzles8 Standard Series 60N
Bit Connection6 5/8 Reg
Junk Slot Area, in234.049
GaugeLength: 2" Protection: Options Available
LengthMake-Up: 11.067 Overall: 16.005
Fishing NeckDiameter: 8 Length: 3.541

Operating Parameters

Bit SpeedSuitable for Rotary & PDM
Weight-on-Bit6,000 To 40,000 (lbs)
2,727 To 18,180 (daN)
3 To 18 (Tonnes)
Flow Rate galUs/min500 To 1200
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 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.

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.

Impregnated diamond material is applied to the gauge pads to enhance wear resistance. This additional diamond volume will help prevent the gauge pads from going under gauge.

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