Guhring 9003290006400 Cobalt Stub Drill Bit 0.025 in

Product Description

The GUHRING 9003290006400 is a cobalt stub-length drill bit designed for precision drilling in demanding materials. Built to DIN 1897 standards, this Series 329 bit features a 0.025-inch diameter with a 130-degree cone relief point and a web-thinned tip geometry that reduces entry force and improves centering accuracy. The straight-cylindrical shank and regular spiral flutes work together to clear chips efficiently in short-hole drilling applications. Rated as a heavy-duty grade M35 cobalt bit, it delivers the heat resistance and edge retention needed when machining titanium alloys and other difficult-to-cut metals. Machinists and precision fabricators are the primary installers of this tool.

This bit is suited for screw machine and short-hole drilling operations where a standard stub or screw-machine length drill is specified. The wire size 72 designation makes it a fit for tight-tolerance bores in aerospace, medical device, and precision machining environments. With a maximum drilling depth of 0.12 inches and a flute-to-diameter ratio of 3xD, it is optimized for shallow, repeatable hole cycles in CNC screw machines, drill presses, and manual precision drilling setups. The bright uncoated finish maintains dimensional accuracy at the cutting edge without coating buildup affecting the h8 diameter tolerance.

Key Features

• M35 cobalt construction provides superior heat resistance for titanium alloy and hard-metal drilling
• 130-degree cone relief point with web thinning improves self-centering and reduces thrust force
• DIN 1897 stub-length geometry keeps the bit rigid and minimizes deflection in small-diameter applications
• h8 diameter tolerance ensures consistent, repeatable hole sizing
• Bright uncoated finish preserves true cutting-edge geometry with no coating-thickness variation
• Right-hand cut with regular spiral flutes for standard chip evacuation in shallow holes

Compatibility

Designed as an OEM-style stub-length drill bit for use in screw machines, CNC drill presses, and precision manual drilling setups requiring a wire size 72 (0.025-inch diameter) cobalt bit conforming to DIN 1897.

Installation Notes

This bit should be installed in a collet or drill chuck rated for the 0.64 mm straight-cylindrical shank diameter; ensure the chuck is clean and fully seated before operation. Power down and lock out the machine before changing bits. Use cutting fluid appropriate for the workpiece material, particularly when drilling titanium alloys, to manage heat at the cutting edge. Inspect the point for wear or chipping before each use, as small-diameter cobalt bits are susceptible to breakage if run in a worn condition or at incorrect feed rates.