Guhring 9003290021800 Cobalt Stub Drill Bit 0.086 in

Product Description

The GUHRING 9003290021800 is a cobalt screw machine length (stub) drill bit designed for high-performance drilling in demanding materials. Built to DIN 1897 standards, this bit measures 0.086 inches (Wire Size 44) in diameter with an overall length of 40 mm and a 130-degree split point angle. The web-thinned geometry reduces thrust force at entry and helps maintain accuracy in harder substrates. With a bright uncoated finish and right-hand spiral flute configuration, this bit is suited for machinists, tool-and-die technicians, and maintenance professionals working with tight tolerances in short-reach applications.

This drill bit is rated for use in titanium alloy as its primary workpiece material, making it a reliable choice for aerospace, precision manufacturing, and industrial maintenance environments. The stub length provides added rigidity compared to jobber-length bits, reducing deflection in shallow-hole applications. A maximum drilling depth of 0.383 inches (9.73 mm) and a 3xD flute-to-diameter ratio make it appropriate for CNC machine centers, drill presses, and manual machining operations where stub-length bits are specified.

Key Features

• Cobalt construction for heat resistance and extended tool life in hard and abrasive materials
• 130-degree point angle optimized for drilling titanium alloy and similar tough workpiece materials
• Web-thinned, parallel web configuration reduces entry thrust and improves chip clearance
• Stub length design increases rigidity and minimizes deflection in short-reach holes
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Built to DIN 1897 specification with a diameter tolerance of +0.000 to -0.014 mm

Compatibility

Designed as a stub-length replacement or production drill bit for machining operations specifying Wire Size 44 (0.086 inches) tooling conforming to DIN 1897. Primary workpiece material compatibility listed as titanium alloy.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with cutting tool setup and machine operation. Secure the straight-cylindrical shank firmly in the appropriate chuck or collet before operation, and verify runout is within acceptable tolerance for the application. Shut down and de-energize any machine tool fully before changing tooling. Do not exceed the recommended maximum drilling depth of 0.383 inches without retracting to clear chips.