Guhring 9006590127000 1/2 in Cobalt Stub Drill Bit

Product Description

The GUHRING 9006590127000 is a cobalt screw machine length (stub) drill bit engineered for high-performance drilling in difficult-to-machine materials. Built to DIN 1897 standards, it features a 130-degree split point with web thinning for fast penetration and reduced walking on entry. The parabolic flute geometry promotes efficient chip evacuation, keeping the cutting zone clear during extended cuts. At 0.5 inches in diameter with a straight-cylindrical shank of matching diameter, this bit installs directly into standard drill chucks or collet holders without adapters. Weighing 0.1 pounds, it is compact enough for tight-access applications while maintaining the rigidity expected of heavy-duty cobalt tooling.

This bit is rated for drilling titanium alloy as its primary workpiece material, making it well-suited for aerospace maintenance, fabrication shops, and industrial production environments where conventional high-speed steel tooling falls short. The stub-length body limits deflection on short-reach applications, and the parallel web configuration provides consistent support across the cutting edge. Machinists and tool-and-die professionals working with hardened or high-tensile materials will find this Series 659 bit a direct fit for demanding production drilling cycles.

Key Features

• Cobalt construction rated for heavy-duty drilling in titanium alloy and other hard materials
• 130-degree drill point angle with web thinning for self-centering entry and reduced thrust
• Parabolic flute design for aggressive chip evacuation in deep-hole applications
• Stub length body minimizes deflection and maximizes rigidity in short-reach setups
• Straight-cylindrical shank fits standard drill chucks and collet systems without adapters
• Manufactured to DIN 1897 specification for consistent dimensional tolerancing

Compatibility

Designed as an OEM-style replacement or direct addition for Series 659 stub-length cobalt drill bit applications conforming to DIN 1897. Compatible with any drill press, CNC machining center, or hand drill equipped with a 1/2-inch or larger chuck capable of accepting a straight-cylindrical shank.

Installation Notes

Installation and operation should be performed by qualified machinists or tool technicians familiar with metal-cutting applications. Ensure the machine spindle is fully stopped and locked out before changing tooling. Secure the shank fully in the chuck or collet to the manufacturer-recommended engagement depth to prevent pullout under load. Do not exceed the maximum drilling depth of 1.258 inches in a single pass without retracting to clear chips, particularly when drilling titanium alloy or other gummy metals.