Hertel 84578319 Jobber Drill Bit Wire 76 Hss

Product Description

The HERTEL 84578319 is a jobber-length twist drill bit designed for precision drilling in light-gauge metals, plastics, and similar materials where tight tolerances are required at small diameters. Sized to wire gauge 76, the bit cuts a 0.0200-inch diameter hole with a standard 118-degree point angle that suits general-purpose entry into most workpiece materials. The high-speed steel construction provides adequate hardness and heat resistance for typical shop and field drilling operations. A bright, uncoated finish is standard on this bit. The right-hand spiral flute geometry evacuates chips efficiently during drilling. Licensed tradespeople and machinists handling precision assembly, electrical, or instrument work are the primary users of this size range.

This bit is suited for applications requiring small-diameter through-holes or pilot holes in sheet metal, circuit boards, thin-wall tubing, and similar substrates. The straight-cylindrical shank allows it to seat directly in standard keyless or keyed drill chucks on hand drills, drill presses, and CNC equipment. At an overall length of 0.875 inches with a 3/16-inch flute length, it is intended for shallow-hole work rather than deep-bore applications. The general-purpose grade makes it a standard production consumable for shops that cycle through small wire-gauge bits regularly.

Key Features

• Wire size 76 diameter: 0.0200 inches for precision small-hole applications
• 118-degree standard point angle for general-purpose entry on common materials
• High-speed steel construction for heat and wear resistance in production use
• Right-hand, regular spiral flute with tapered web for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Web-thinned geometry reduces thrust force at the cutting edge

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard keyed and keyless drill chucks accepting a 0.0200-inch straight-cylindrical shank.

Installation Notes

This bit is installed and replaced by machinists, electricians, or technicians using standard drill chuck equipment. Secure the shank fully in the chuck and verify concentricity before operation to avoid deflection at this small diameter. At 0.0200 inches, the bit is highly susceptible to breakage from side loading, excessive feed pressure, or workpiece movement — clamp the workpiece securely and use a low, consistent feed rate. Inspect the cutting edges before each use and replace when dulling is observed rather than attempting to regrind at this diameter.