12 1/4 in MDSiZ516(311.15 mm)

Product ID: 66078A0001 ER 26358

Design Specifications

Total Cutters63
Cutter Size16mm (5/8 in)
Face Cutters(30) 16mm
Gauge Cutters(4) 16mm
Cone Cutters(9) 16mm
Back-Up Cutters(20) 16mm
Blade Count5
Nozzles7 Standard Series 60N
Bit Connection6 5/8 Reg
Junk Slot Area, in233.705
GaugeLength: 3" Protection: Options Available
LengthMake-Up: 11.407 Overall: 16.345
Fishing NeckDiameter: 8 Length: 3.519

Operating Parameters

Bit SpeedSuitable for motor or rotary
Weight-on-Bit12,000 To 35,000 (lbs)
5,454 To 15,908 (daN)
5 To 16 (Tonnes)
Flow Rate galUs/min500 To 1000
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.

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 advanced ONYX cutter technology. This includes the next generation ONYX II cutters that have superior abrasive wear and exceptional resistance to thermal degradation, enhancing cutter durability for increased footage drilled and faster ROP.