Hertel 79891990 Solid Carbide Jobber Drill Bit No. 40

Product Description

The HERTEL 79891990 is a solid carbide jobber-length drill bit in wire gauge size No. 40, with a decimal diameter of 0.0980 inches. Built from C2-grade solid carbide and finished with a bright coating, this bit delivers consistent, accurate holes in ferrous and non-ferrous metals, plastics, and composite materials. The 118-degree standard point angle provides a versatile cutting geometry suited to a wide range of substrates. With a 2-inch overall length and a 1-inch flute length, it fits standard jobber-length applications where controlled depth and chip evacuation matter. A web-thinned, tapered-web design reduces thrust and improves penetration at small diameters.

This drill bit is intended for precision drilling in metalworking, maintenance, and fabrication environments. Its straight-cylindrical shank seats directly into standard drill chucks and collet holders without adapters. The right-hand spiral flute promotes efficient chip removal during through-hole and blind-hole drilling. It is well suited for machine shop use, production drilling, and field maintenance work where small-diameter accuracy is critical. Machinists, tool-and-die makers, and maintenance technicians are the primary users.

Key Features

• Solid carbide C2-grade construction for wear resistance and dimensional stability in demanding applications
• Wire gauge No. 40 diameter (0.0980 inches) with a tight tolerance of -0.0005 to 0.0000 inches for precise hole sizing
• 118-degree standard point angle for versatile use across metals and plastics
• Web-thinned, tapered-web design reduces drilling thrust at small diameters
• Bright finish with 2-flute regular spiral for efficient chip evacuation
• Straight-cylindrical shank for direct chuck or collet mounting with no adapter required

Compatibility

Designed as a jobber-length replacement or production drill for applications requiring wire gauge No. 40 (0.0980-inch) diameter holes, fitting any standard drill chuck or collet system that accepts a 0.0980-inch straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill presses, CNC machining centers, or hand-held power drills with compatible collets or chucks. Secure the shank fully in the chuck before operation and verify concentricity to avoid premature breakage at this small diameter. Coolant-through is not supported on this bit; apply cutting fluid externally when drilling steel or stainless to manage heat. Inspect the cutting edges before each use, as solid carbide tips are brittle and susceptible to chipping if dropped or mishandled.