12 1/4 in MiZ616(311.15 mm)

Product ID: 66493A0001 ER 26707

Design Specifications

Total Cutters55
Cutter Size13mm (1/2 in), 16mm (5/8 in)
Face Cutters(39) 16mm
Gauge Cutters(6) 16mm
Cone Cutters(7) 13mm, (3) 16mm
Blade Count6
Nozzles5 Standard Series 60N, 2 Standard Series 50N
Bit Connection6 5/8 Reg
Junk Slot Area, in227.34
GaugeLength: 3" Protection: Options Available
LengthMake-Up: 11.263 in Overall: 16.201 in
Fishing NeckDiameter: 8 in Length: 3.521

Operating Parameters

Bit SpeedSuitable for Rotary, Steerable Motor & Rotary Steerable BHA
Weight-on-Bit12,000 To 40,000 (lbs)
5,454 To 18,180 (daN)
5 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 PX feature places thermally stable diamond inserts (TSP) on the gauge to maximize gauge retention and extend bit life.

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.

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.

Increased cleaning, cooling, and cuttings evacuation with available hydraulic flows; high flow rates with minimal increase in pump pressure, and reduced risk a bit balling.