Guhring 9055200105000 Cobalt Stub Drill Bit 0.4134 in

Product Description

The GUHRING 9055200105000 is a cobalt stub-length (screw machine length) drill bit designed for high-speed drilling in metalworking and fabrication applications. Measuring 10.50 mm (0.4134 inches) in diameter with an overall length of 89.00 mm (3.504 inches), it features a 118-degree four-facet split point geometry and a web-thinned, tapered web configuration for reduced thrust and faster penetration. The two-flute spiral design and right-hand cut are suited for production drilling environments where tool life and hole quality matter. Built to DIN 1897 standards, this bit is appropriate for licensed machinists, toolroom technicians, and maintenance professionals.

This drill bit is sized for stub-length applications where rigidity and reduced deflection are priorities over extended reach. The cobalt construction provides elevated heat resistance, making it well-suited for drilling aluminum and other non-ferrous materials where conventional high-speed steel bits wear prematurely. The straight-cylindrical shank accepts standard drill chucks and collet holders. With a flute-by-diameter ratio of 3xD and a maximum drilling depth of 27.25 mm (1.073 inches), this bit is appropriate for short, repeatable through-hole or blind-hole operations on CNC machining centers, drill presses, and manual mills.

Key Features

• Cobalt tool material for extended heat resistance and tool life in demanding materials
• 118-degree four-facet split point with web thinning reduces entry thrust and improves self-centering
• Tapered web configuration supports chip evacuation in short-flute stub drilling
• Straight-cylindrical shank fits standard chucks and collet systems without modification
• Built to DIN 1897 specification for consistent dimensional accuracy across production runs
• Diameter tolerance of +0.000 to -0.027 mm for controlled hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit suitable for standard drill chucks and collet holders accepting a 10.50 mm straight-cylindrical shank. Fits drill bit size range of 0.4000 to 0.4500 inches (9.50 to 11.00 mm). Primary workpiece material is aluminum; cobalt construction also supports use in other non-ferrous and low-alloy materials where heat buildup is a concern.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill chucks or collet holders. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify shank seating and chuck tightness before initiating a cut to prevent runout or tool pull-out. Observe manufacturer and facility guidelines for cutting speeds and feeds appropriate to the workpiece material; do not exceed the maximum drilling depth of 1.073 inches per pass without retracting to clear chips.