Guhring 9006600006400 Micro Drill Bit Size 72 Cobalt

Product Description

The GUHRING 9006600006400 is a wire gauge size 72 micro drill bit designed for precision drilling in tight-tolerance applications. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced heat buildup at high spindle speeds. The drill features a 118-degree faceted point angle, spiral flute geometry, and a web-thinned tapered web for improved chip evacuation and reduced thrust force. Overall length is 0.984 inches with a straight-cylindrical shank diameter of 1.00 mm. This bit is intended for use by machinists, tool-and-die technicians, and precision fabricators working with small-diameter bores.

This micro drill is suited for drilling aluminum, non-ferrous metals, and titanium alloys in precision machining environments. The 5xD flute-to-diameter ratio supports deeper hole entry relative to bit diameter, making it practical for small-feature work in aerospace components, electronics hardware, and precision mechanical assemblies. It conforms to DIN 1899 specification, which governs short twist drills for micro applications. The 0.1280-inch maximum drilling depth keeps the application range focused on shallow, accurate bores in production and repair contexts.

Key Features

• Wire gauge size 72, decimal diameter 0.0252 inches, with a diameter tolerance of +0.000 to -0.004 mm for tight-tolerance work
• Cobalt substrate provides higher heat resistance than standard HSS, extending tool life in harder and abrasive workpiece materials
• TiN coating reduces friction and built-up edge, improving surface finish and chip flow
• 118-degree faceted point with web thinning reduces entry force and improves centering accuracy
• Spiral flute with regular spiral type supports consistent chip evacuation in short-depth micro bores
• Conforms to DIN 1899 specification for micro twist drills

Compatibility

Designed for use in precision drilling of aluminum, non-ferrous metals, and titanium alloys. Compatible with standard CNC machining centers, manual drill presses, and high-speed spindles accepting a 1.00 mm straight-cylindrical shank. Suitable for workpiece material codes K, M, N, P (aluminum and non-ferrous) and S (titanium alloys) per ISO material classification.

Installation Notes

Installation and use should be performed by qualified machinists familiar with micro-diameter tooling protocols. Secure the straight-cylindrical shank firmly in a collet or precision chuck rated for 1.00 mm shanks before use; runout must be minimized to avoid bit breakage at this diameter. Power down and lock out the machine spindle before changing or inspecting the bit. Micro drills at this diameter are brittle under lateral load — avoid side pressure and ensure the workpiece is rigidly fixtured.