8 1/2 in K503T(215.9 mm)

Product ID: 6420561001 ER 23281 IADC M842

Design Specifications

Avg. SPC116
Face Cutters(27) 13mm
Gauge Cutters(15) 13mm
Cone Cutters(5) 13mm
Blade Count15
Hydraulics (sq in)1.5 TFA
Bit Connection4 1/2 Reg Box
LengthMake-Up: 11 3/8 in Overall: 15 9/16 in
Fishing NeckDiameter: 6" Length: 4 7/16 in
GaugeLength: 4" Protection: 12" Turbine Sleeve

Operating Parameters

Rotary SpeedSuitable for Turbine & PDM
Weight-on-Bit7,000 To 30,000 (lbs)
3,182 To 13,635 (daN)
3 To 14 (Tonnes)
Flow Rate (GPM)300 To 600
Hydraulic Horsepower (HSI)1 To 5
The operating parameters listed here are general parameters, please contact your local Smith Bits representative for precise recommendations for your individual well.



Superior GHI diamond distribution increases durability and ensures maximum ROP for longer periods of time

Open bit face improves hydraulic flow and optimizes cleaning for increased ROP

GHI inserts are extremely resistant to abrasion. Locating these inserts on gauge maximizes gauge durability, and ensures that a full gauge hole will be drilled.

Turbine sleeves reduce vibration and hole spiraling in turbine applications. This feature increases bit life and enables the bit to achieve maximum ROP