Guhring 9003290007900 Cobalt Drill Bit Size 68

Product Description

The GUHRING 9003290007900 is a cobalt screw machine length (stub) drill bit in wire size 68, equivalent to 1/32 inch (0.0310 inch decimal). It features a 130-degree split point geometry with web thinning for reduced thrust and cleaner entry on hard materials. The spiral flute, straight-cylindrical shank design conforms to DIN 1897 standards. With an overall length of 0.9449 inches and a flute length of 0.197 inches, this bit is engineered for short, rigid setups in screw machine and CNC drilling applications. Licensed machinists and toolroom technicians working with tight-tolerance, small-diameter holes rely on this series for consistent performance in demanding materials.

This drill bit is designed primarily for drilling titanium alloy and similarly hard workpiece materials where cobalt-grade tool steel provides the heat resistance and edge retention that high-speed steel cannot sustain. The stub length format offers maximum rigidity, making it well suited for CNC machining centers, automatic screw machines, and manual drill press work where runout and deflection must be minimized. The bright, uncoated finish makes wear and edge condition easy to inspect between uses.

Key Features

• Cobalt tool material for heat resistance and edge retention in hard alloys including titanium
• 130-degree standard point angle with web thinning reduces entry thrust and improves hole accuracy
• DIN 1897 stub length format provides maximum rigidity and minimal deflection
• Right-hand cutting, regular spiral flute with parallel web configuration
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Bright uncoated finish allows easy visual inspection of cutting edge condition

Compatibility

Designed as a DIN 1897 Series 329 stub drill for use in screw machines, CNC machining centers, and drill press applications requiring a size 68 wire gauge hole in titanium alloy and comparable hard workpiece materials.

Installation Notes

Install and remove this bit only with the machine fully powered down and the spindle at a complete stop. Use a properly sized collet or drill chuck to secure the straight-cylindrical shank and verify runout before drilling, as shank diameter tolerance is critical at this small diameter. Cobalt bits can be resharpened by qualified tool grinders but require correct point angle maintenance to preserve the 130-degree geometry and web thinning. Follow applicable shop safety procedures and machine manufacturer guidelines for small-diameter tooling speeds and feeds.