Guhring 9038990019800 Micro Drill Bit 5/64 in Carbide

Product Description

The GUHRING 9038990019800 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 140-degree faceted point, a TiAlN coating for heat and wear resistance, and a web-thinned geometry that reduces thrust force at entry. The overall length is 38 millimeters with a flute length of 12 millimeters, and the straight-cylindrical shank measures 3 millimeters in diameter with an h7 tolerance. Licensed machinists, tool-and-die workers, and precision fabricators working with tight-tolerance holes will find this bit suited to their requirements.

This micro drill bit is intended for use in ferrous workpiece materials, specifically cast iron and steel, classified under material codes K and P. The 5xD flute-to-diameter ratio supports a maximum drilling depth of approximately 0.356 inches (9.03 millimeters), making it appropriate for shallow precision bores in production machining, mold work, and component fabrication where hole diameter control and surface finish are critical. It cuts in the right-hand direction and is used without coolant-through capability.

Key Features

• Solid carbide construction in material grade K40 for rigidity and wear resistance in hard materials
• TiAlN coating extends tool life at elevated cutting temperatures
• 140-degree faceted point angle reduces walking and improves entry accuracy on flat and curved surfaces
• Web-thinned geometry lowers axial thrust, reducing deflection risk in micro-diameter applications
• Straight-cylindrical shank with h7 diameter tolerance ensures consistent chuck runout
• Regular spiral flute type promotes chip evacuation in cast iron and steel

Compatibility

Designed as a Series 3899 micro drill bit for use in ferrous materials including cast iron and steel; compatible with standard drill chucks and collets accepting a 3-millimeter straight-cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or toolroom personnel familiar with micro-diameter tooling. Secure the shank fully in a high-precision collet or drill chuck to minimize runout before operation. Always verify spindle speed and feed rate are appropriate for the workpiece material and bit diameter before drilling. Carbide tooling is brittle — avoid side loading, interrupted cuts at high feed, or dropping the bit on hard surfaces.