Guhring 9038990004800 Micro Drill Bit 0.48mm Carbide

Product Description

The GUHRING 9038990004800 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 0.48 mm diameter with a 140-degree faceted point angle and a TiAlN coating that extends tool life in abrasive materials. The straight-cylindrical shank measures 3.00 mm in diameter, making it compatible with standard collet chucks used in CNC machining centers and precision drill presses. Web thinning reduces thrust force at entry, which is critical when working at this scale. Licensed machinists and tool-and-die professionals are the primary installers of this bit.

This micro drill bit is suited for precision drilling in cast iron and steel workpieces, matching primary material codes K and P. The 5xD flute-to-diameter ratio and 7.00 mm flute length support a maximum drilling depth of 6.28 mm (0.247 inches). It is well matched to high-speed CNC operations where tight tolerances and consistent hole geometry are required. The h7 diameter tolerance ensures repeatable fitment in precision boring and assembly workflows common in automotive, mold-making, and general machining environments.

Key Features

• 0.48 mm diameter with h7 tolerance for tight, repeatable hole geometry
• 140-degree faceted point angle reduces walking and improves entry accuracy
• TiAlN coating provides heat and wear resistance in ferrous materials
• Web-thinned geometry lowers cutting thrust at micro diameters
• Solid carbide construction in K40 grade for rigidity at small diameters
• Spiral flute, right-hand cut with regular spiral type for consistent chip evacuation

Compatibility

Designed for use in cast iron and steel workpieces; compatible with standard collet chucks accepting a 3.00 mm straight-cylindrical shank. Part of the GUHRING Series 3899 micro drill line.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with CNC or precision drill press operations. Ensure the spindle and collet are fully de-energized and at rest before changing tooling. Verify collet runout is within acceptable limits before use, as excessive runout at micro diameters accelerates tool wear and increases breakage risk. Do not exceed the manufacturer-rated maximum drilling depth of 6.28 mm in a single pass without appropriate peck-drilling cycles.