Hertel 84578335 Jobber Drill Bit Wire 78 Hss

Product Description

The HERTEL 84578335 is a wire gauge size 78 jobber length drill bit manufactured from high speed steel with a bright uncoated finish. Sized at 0.0160 inches in diameter, it features a 118-degree standard point angle and a two-flute regular spiral design with a tapered web configuration and web thinning for improved chip clearance and entry performance. The straight-cylindrical shank measures 0.0160 inches in diameter and the overall length is 0.875 inches (7/8 inches). Right-hand cutting direction is standard. This bit is suited for general purpose drilling applications and is installed by machinists, maintenance technicians, and tradespeople working with small-diameter precision holes.

This drill bit is designed for general purpose drilling in light metals, plastics, and similar materials where small-diameter wire gauge size holes are required. The wire size 78 designation corresponds to 0.0160 inches, placing it in the 0.0000 to 0.0500 inch size range. It is commonly used in light fabrication, instrument work, electrical panel work, and precision maintenance tasks. The jobber length format provides a balance of reach and rigidity for bench drill press and hand drill applications. Sold individually, with a minimum order quantity of 12 units.

Key Features

• Wire gauge size 78 at 0.0160 inches diameter for small-diameter precision drilling
• High speed steel construction for general purpose use across light metals and plastics
• 118-degree standard point angle with web thinning for improved penetration and reduced walking
• Two-flute regular spiral with tapered web for efficient chip evacuation
• Straight-cylindrical shank at 0.0160 inches for compatibility with standard drill chucks
• Bright uncoated finish — no coating buildup to affect tolerance in tight-diameter applications

Compatibility

Designed as a general purpose jobber length drill bit for use in standard drill chucks and drill presses that accommodate straight-cylindrical shanks in the 0.0000 to 0.0500 inch diameter range.

Installation Notes

Install and remove drill bits only with the drill press or hand drill fully powered down and the chuck key removed from the chuck. Secure the shank firmly in the chuck before operation to prevent slippage at small diameters. For wire gauge sizes this small, use a drill press with a feed stop or a steady hand to avoid bit deflection and breakage. Consult applicable workplace safety standards when operating high-speed rotating tooling.