Hertel 83246009 Solid Carbide Jobber Drill Bit No. 78

Product Description

The HERTEL 83246009 is a solid carbide jobber-length drill bit in wire gauge size No. 78, equivalent to 0.0160 inches in decimal diameter. Built for precision drilling in hard and abrasive materials, it features a 118-degree standard point angle with web thinning for reduced thrust and cleaner entry. The bright finish leaves the carbide substrate exposed for maximum hardness. At 0.75 inches overall length with a 0.1875-inch flute length, this is a small-format bit designed for tight-tolerance work in electronics, instrument manufacturing, tool and die, and precision machining applications. A licensed machinist or tool-and-die technician is the typical end user.

This bit is suited for drilling small-diameter holes in ferrous and non-ferrous metals, PCB materials, hard plastics, and composite substrates where high-speed steel bits lack the hardness or edge retention required. The straight cylindrical shank fits standard collets, chucks, and micro-drill spindles used on CNC machining centers, drill presses, and precision benchtop units. Its general-purpose grade C2 carbide formulation covers a broad range of work materials at moderate to high spindle speeds typical of fine-diameter drilling.

Key Features

• Solid carbide construction for superior hardness and wear resistance compared to HSS
• No. 78 wire size, 0.0160 inch decimal diameter with a tight tolerance of -0.0005 to 0.0000 inches
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Regular spiral, right-hand cut with two flutes for efficient chip evacuation in small bores
• Bright (uncoated) finish preserves full carbide hardness at the cutting edge
• Straight-cylindrical shank seats directly in standard collets and micro-drill chucks

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for any collet or chuck system accepting a 0.0160-inch straight cylindrical shank, including CNC machining centers, drill presses, and benchtop micro-drill units used in general-purpose precision drilling operations.

Installation Notes

Installation is performed by a machinist or tooling technician. Secure the straight shank fully in a properly sized collet or drill chuck before operation, and verify runout is within acceptable limits for the diameter being drilled. Power down and de-energize the spindle before changing or inspecting tooling. Carbide is brittle at this diameter — avoid side loading, interrupted cuts without proper feed rates, and contact with hard surfaces that can chip the cutting edge.