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The 8 1/2'' S419 Steel Body PDC Drilling Bit is engineered for medium-to-hard formations. Built on a one-piece S419 steel body with a five-blade cutting structure, this bit balances aggressiveness with lateral stability in interbedded limestone, sandstone, and dolomite. It delivers stable rate of penetration (ROP) and extended on-bottom hours across various industrial applications, including oil and gas, geothermal, water well, and mining exploratory drilling.
The bit features spiral flutes that sweep cuttings away efficiently, maintaining clear visibility of the hole face for drilling fluid. Nickel-hardened gauge pads resist abrasive wear, helping operators maintain full gauge diameter, reduce wiper trips, and achieve a smoother bottom hole assembly (BHA) ride. Operators typically deploy this bit for vertical and directional intervals where consistent ROP, predictable torque response, and compatibility with measurement while drilling (MWD) and logging while drilling (LWD) systems are primary objectives.
The bit incorporates five blades with 13 mm PDC cutters, providing effective rock shearing without chatter in medium-to-hard sequences. This design performs consistently when geology transitions from friable sands to cemented streaks, delivering predictable performance across interbedded sections.
Three precision jetted nozzles focus drilling fluid flow directly at the bit face. This design enables fast cuttings removal, maintains smooth torque levels, and reduces regrinding and heat generation. Nozzle swaps allow hydraulic tuning for different mud systems and well conditions.
Full-circumference tungsten-carbide hardfacing on gauge pads provides effective diameter control throughout the bit run. This protection helps maintain hole quality, facilitating subsequent casing and reaming operations.
The heat-treated S419 alloy steel body and robust cutter braze joints deliver stability in high-temperature environments up to 150°C. The bit is compatible with both water-based mud (WBM) and oil-based mud (OBM) systems.
The bit features a standard API REG pin connection, straightforward nozzle replacement, and follows conventional break-in practices. These characteristics minimize crew learning curves and streamline rig operations across mixed equipment fleets.
Item | Value |
Bit Size | 8 1/2'' (215.9 mm) |
Model | S419 Steel Body PDC Drilling Bit |
Body Material | S419 alloy steel, heat-treated (HRC 45-50) |
Blade Count | 5 blades |
Primary Cutter | 13 mm PDC cutters |
Nozzles | 3 × 16 mm jetted nozzles |
Gauge Protection | Tungsten-carbide hardfacing on gauge pads |
Flow Capacity | Up to 600 GPM (design dependent) |
Max Operating Temperature | Up to 150°C (design dependent) |
Standards | API Spec 7-1 (manufacturing compliance) |
Recommended Mud Systems | WBM / OBM |
Connection | 4-1/2'' API REG PIN (typical for this size class) |
This PDC drilling bit is suitable for medium to hard formations, including limestone, sandstone, and dolomite with abrasive stringers. It performs effectively in both vertical and directional drilling operations, making it a versatile choice for various commercial drilling projects.
Common applications include geothermal kick-off intervals, water well sections, oil and gas production zones, and mining exploratory holes. The bit's predictable torque response and stable ROP make it particularly well-suited for intervals where trajectory control and consistent performance are critical.
This bit is designed for medium to hard formations, including limestone, sandstone, and dolomite with abrasive stringers. The five-blade layout and 13 mm cutters balance speed and stability in interbedded sections.
Operators should follow conventional PDC drilling practices for this diameter: moderate weight on bit (WOB) with steady RPM and sufficient flow to keep the bit face clean. Nozzle swaps allow hydraulic tuning for WBM or OBM systems, maintaining a cool, debris-free cutting zone.
Yes. Customization options include cutter grade, back-rake angle, secondary chamfers, nozzle sizing, and optional gauge features. Share lithology data, interval length, planned mud system, and rig limitations to receive a configuration matched to your specific objectives.
By maintaining gauge diameter, clearing cuttings efficiently, and limiting torque spikes, the bit reduces non-productive time. This results in fewer wiper trips, cleaner casing runs, and more consistent ROP across the drilling section.
This bit delivers predictable productivity through its S419 steel body construction and balanced five-blade pattern, reducing time lost to torque spikes or unexpected trips. Standard API connections and common nozzle sizes enable seamless integration across mixed equipment fleets, streamlining rig-up procedures.
Manufacturing and inspection practices align with API Spec 7-1 and ISO-style quality management systems, reducing performance variation between individual bits. Comprehensive application support includes formation review, nozzle selection guidance, and post-run dull grading, helping teams achieve repeatable performance across multiple wells.
