Guhring 9038990003800 Micro Drill Bit 0.38mm Solid Carbide

Product Description

The GUHRING 9038990003800 is a solid carbide micro drill bit designed for precision drilling in demanding industrial and toolroom applications. Built from K40-grade carbide and coated with TiAlN for heat and wear resistance, this bit operates at a 0.38 mm diameter with a 140-degree faceted point that delivers accurate entry and clean hole geometry. The right-hand spiral flute configuration evacuates chips efficiently, while the web-thinned point reduces thrust and minimizes deflection at small diameters. Licensed machinists, tool-and-die technicians, and precision manufacturing shops are the typical end users for this class of tooling.

This drill bit is suited for precision micro-hole drilling in cast iron and steel workpieces. With a flute-to-diameter ratio of 5xD and a maximum drilling depth of 5.43 mm, it handles shallow-to-moderate depth holes in ferrous materials common to mold making, die work, medical device manufacturing, and electronics component fabrication. The straight-cylindrical shank at 3.00 mm diameter allows direct chucking in standard collet or drill chuck setups on CNC machining centers, drill presses, and precision manual machines.

Key Features

• 0.38 mm cutting diameter with h7 diameter tolerance for tight, consistent hole sizing
• TiAlN coating provides elevated-temperature wear resistance in ferrous and abrasive materials
• 140-degree faceted point with web thinning reduces entry thrust and improves positional accuracy
• K40-grade solid carbide construction delivers rigidity and edge retention at micro scale
• 5xD flute-to-diameter ratio supports drilling depths up to 5.43 mm
• Right-hand spiral flute promotes efficient chip evacuation in blind and through-hole applications

Compatibility

Designed as a Series 3899 micro drill bit for use in cast iron and steel workpieces. Suitable for use in any precision spindle or collet system accepting a 3.00 mm straight-cylindrical shank.

Installation Notes

Installation and operation of micro drill bits should be performed by qualified machinists or toolroom technicians familiar with high-speed precision drilling. Before mounting, ensure the spindle or collet is clean and free of runout, as any eccentricity at this diameter scale significantly increases breakage risk. Use the lowest feasible entry feed rate and confirm spindle speed matches the manufacturer recommendations for the workpiece material. Never apply side load to the bit during drilling operations.