Guhring 9003010004100 Micro Drill Bit Wire 78 Cobalt

Product Description

The GUHRING 9003010004100 is a cobalt micro drill bit engineered for precision drilling in demanding materials. Built to DIN 1899 standards, this wire-gauge size 78 bit measures 0.0161 inches (decimal) in diameter with a 118-degree faceted point angle and a web-thinned, tapered web configuration that reduces entry force and improves centering accuracy. The overall length is 0.984 inches, with a spiral flute and straight-cylindrical shank. It is designed for use by machinists, tool-and-die technicians, and precision fabricators who require consistent, repeatable results in small-hole applications.

This bit is suited for drilling aluminum, titanium alloy, and similar workpiece materials in production and prototype environments. The 5xD flute-to-diameter ratio supports efficient chip evacuation at shallow depths. Maximum drilling depth is 0.094 inches. The bright, uncoated finish keeps the cobalt substrate exposed for direct heat dissipation during dry or mist-lubricated operations. It is a strong fit for aerospace, electronics, and precision mechanical assembly applications where hole location and diameter tolerance are critical.

Key Features

• Wire gauge size 78, 0.0161 inches diameter with tight tolerance of +0.000 to -0.004 mm
• 118-degree faceted point angle with web-thinned, tapered web for accurate entry
• Cobalt construction for heat resistance in titanium alloy and aluminum drilling
• Spiral flute, right-hand cut, 5xD flute-to-diameter ratio for chip clearance
• Straight-cylindrical shank for standard collet or chuck mounting
• Bright, uncoated finish per DIN 1899 Series 301 specification

Compatibility

Designed as a precision replacement micro drill bit for applications requiring wire gauge size 78 tooling in standard straight-shank drill chucks or collet systems. Primary workpiece materials include aluminum and titanium alloy.

Installation Notes

Installation and use should be performed by qualified machinists or tool-and-die technicians familiar with micro-diameter tooling. Ensure the drill chuck or collet is clean, concentric, and properly tightened before use to prevent runout, which can cause breakage at this diameter. Use appropriate cutting fluid or mist lubrication unless operating conditions require dry cutting. Do not exceed the maximum drilling depth of 0.094 inches per pass without retracting to clear chips.