Guhring 9006590040400 Screw Machine Drill Bit Cobalt

Product Description

The GUHRING 9006590040400 is a cobalt screw machine length (stub) drill bit designed for demanding hole-making operations in hard and abrasive materials. Built to DIN 1897 standards, this heavy-duty bit measures 0.159 inches (wire size 21) in diameter with an overall length of 2.1654 inches and a parabolic flute geometry for improved chip evacuation. The 130-degree split point with web thinning reduces thrust and improves center-starting accuracy. A straight-cylindrical shank provides consistent grip in standard drill chucks and CNC toolholders. This bit is suited for machinists, tool and die technicians, and production drilling professionals working with high-strength alloys.

The 9006590040400 is engineered for drilling titanium alloys and other hard metals where standard high-speed steel bits fail prematurely. Its stub-length body limits deflection in short-reach applications and improves rigidity on machining centers, drill presses, and manual machines. The parabolic flute profile with a 3xD flute-to-diameter ratio clears chips efficiently in deep-relative-to-diameter holes. The parallel web configuration and coated cobalt construction extend tool life in high-temperature cutting conditions common in aerospace, defense, and precision manufacturing environments.

Key Features

• Cobalt construction rated for heavy-duty drilling in titanium alloys and hard metals
• Parabolic flute geometry with 3xD ratio for efficient chip evacuation
• 130-degree drill point angle with web thinning for reduced entry thrust
• DIN 1897 stub-length body minimizes deflection and improves hole accuracy
• Straight-cylindrical shank compatible with standard chucks and collets
• No coolant-through design for use in conventional drilling setups

Compatibility

Designed as a DIN 1897 Series 659 stub-length replacement bit for use in standard drill chucks, collet holders, and CNC toolholding systems accepting a 0.1591-inch straight-cylindrical shank. Primary workpiece material is titanium alloy per manufacturer specification.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with cutting tool selection and machine setup. Ensure the machine spindle is fully stopped and the machine is locked out before changing tooling. Secure the shank fully within the chuck or collet to the recommended grip depth to prevent pullout under load. Verify spindle speed and feed rate are appropriate for the workpiece material and bit diameter before beginning the cut.