Hertel 74129271 Carbide Die Drill Bit 5/16 Inch

Product Description

The HERTEL 74129271 is a solid carbide, straight-flute die drill bit designed for precision drilling in hard and difficult-to-machine metals. Built from C2-grade carbide with a bright finish, this bit features a 140-degree notched point and web-thinned geometry that reduces thrust and improves chip evacuation at entry. The 5/16-inch diameter shank and cutting edge are ground to a tight tolerance of +0.0000 to -0.0005 inches, making it well-suited for applications where hole accuracy and surface finish are critical. It is installed by machinists and tool-and-die professionals working in demanding production and job-shop environments.

This drill bit is engineered for right-hand cutting in ferrous and high-alloy materials including stainless steel, chrome alloy, heat-treated alloy, nickel alloy, titanium alloy, and general steel stock. The straight-flute design is particularly effective in materials prone to chatter or chip-packing, providing better control in short, through-hole, and blind-hole applications. It is commonly used in die and mold making, aerospace component machining, and precision fabrication where standard twist drills underperform.

Key Features

• Solid C2-grade carbide construction for rigidity and wear resistance in hard metals
• 140-degree notched point reduces walking and improves hole entry accuracy
• Web-thinned geometry lowers cutting thrust and extends tool life
• Tight diameter tolerance of +0.0000 to -0.0005 inches for precise hole sizing
• Straight-flute design controls chip flow in gummy or stringy alloys
• Bright finish suitable for dry cutting or use with standard cutting fluids

Compatibility

Designed for use in primary and secondary workpiece materials including chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy. Verify spindle speed and feed rate compatibility with your machine tool before use.

Installation Notes

This bit is installed by machinists in drill presses, CNC machining centers, or manual milling machines using a compatible 5/16-inch collet or chuck. Ensure the spindle is fully stopped and the workpiece is securely clamped before changing tooling. Coolant-through is not supported on this bit; apply cutting fluid externally as required by the workpiece material. Follow the machine manufacturer and applicable shop safety guidelines for speeds and feeds when drilling hard alloys.