Hertel 79892790 Carbide Jobber Drill Bit 27/64 in

Product Description

The HERTEL 79892790 is a solid carbide jobber-length drill bit designed for high-performance drilling in hard and abrasive materials. It measures 27/64 inch (0.4219 inch) in diameter with a 4.5-inch overall length and a 2.875-inch flute length. The 118-degree standard point angle and web-thinned, tapered web design reduce entry force and improve chip evacuation at the start of the cut. The bright (uncoated) finish is suited for applications where coating interaction with the workpiece material is a concern. This bit is sized and built for use by machinists, tool-and-die workers, and maintenance technicians working in shop or field environments.

This drill bit is appropriate for drilling ferrous and non-ferrous metals, cast materials, and other hard substrates where carbide tooling outperforms high-speed steel. The straight-cylindrical shank accepts standard drill chucks and collet holders without modification. Its regular spiral flute geometry supports efficient chip removal in through-hole and blind-hole drilling operations across production and repair environments.

Key Features

• Solid carbide construction rated at material grade C2 for hardness and wear resistance
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and cleaner entry
• Bright finish with no coating for broad material compatibility
• Right-hand cut with 2-flute regular spiral geometry for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collet systems
• Diameter tolerance of -0.0005 to 0.0000 inch for close-tolerance hole sizing

Compatibility

Designed as a jobber-length replacement or production drill bit for use in any standard drill press, machining center, or hand drill equipped with a compatible chuck or collet accepting a 27/64-inch straight shank.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Secure the shank fully in the chuck or collet before operation and verify runout before beginning a cut. Power down and de-energize the spindle before changing or inspecting the bit. Solid carbide tooling is brittle compared to high-speed steel and should not be subjected to lateral shock loads or used in hand-drilling applications where flexing or angular entry is likely.