Guhring 9038990011000 Micro Drill Bit 1.1mm Carbide Tialn

Product Description

The GUHRING 9038990011000 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 1.1 mm (0.0433 inch) diameter with a faceted 140-degree split point and a TiAlN coating that extends tool life in high-temperature cutting environments. The spiral flute geometry and web-thinned construction reduce thrust force and improve chip evacuation in deep holes. At 38 mm overall length with a 3 mm straight-cylindrical shank, it fits standard collets and chucks found on CNC machining centers and precision drill presses. This is a right-hand cut tool built to h7 diameter tolerance for consistent, repeatable hole quality.

This micro drill bit is suited for small-diameter hole drilling in cast iron and steel workpieces, including both general-purpose and precision machined components. The 5xD flute-to-diameter ratio and 10 mm flute length support drilling to a maximum depth of 8.35 mm (0.329 inch). It is commonly used in aerospace, automotive, die and mold, and general machining operations where tight hole tolerances and surface finish are critical. Machinists and CNC operators working with ferrous materials will find this drill well matched to both production and prototype applications.

Key Features

• 1.1 mm diameter with h7 tolerance for precise, repeatable hole sizing
• Solid carbide construction in K40 grade for rigidity and wear resistance in ferrous materials
• TiAlN coating improves heat resistance and extends tool life in steel and cast iron
• Faceted 140-degree point with web thinning reduces thrust and improves centering
• Spiral flute design promotes efficient chip evacuation in blind and through holes
• 3 mm straight-cylindrical shank for compatibility with standard collets and chucks

Compatibility

Designed for use in cast iron and steel workpieces as stated in the manufacturer specifications. Fits standard toolholders and collets accepting a 3 mm straight-cylindrical shank.

Installation Notes

Installation and use of this tool should be performed by qualified machinists familiar with small-diameter carbide tooling. Secure the shank fully in a collet or drill chuck rated for the intended spindle speed before operation. Carbide micro drills are brittle — avoid lateral loading, interrupted cuts without proper feed control, and running the tool in worn or undersized holders. Follow machine manufacturer guidelines and applicable workplace safety standards when setting speeds and feeds for the workpiece material.