Guhring 9055200031000 Cobalt Stub Drill Bit 0.122 in

Product Description

The GUHRING 9055200031000 is a cobalt stub-length (screw machine length) drill bit designed for high-speed drilling in production and shop environments. Built to DIN 1897 standards, it measures 0.122 inches (3.10 mm) in diameter with an overall length of 49.00 mm and a flute length of 18.00 mm. The 118-degree four-facet split point reduces walking at entry and lowers thrust force, making it well suited for precision drilling in soft to medium-hardness materials. The two-flute spiral design with a web-thinned, tapered web configuration promotes efficient chip evacuation and consistent cutting performance. Licensed machinists, tool-and-die makers, and general metalworking shops are the primary installers and users of this bit.

This drill bit is rated for primary use in aluminum and similar non-ferrous workpiece materials, though its cobalt construction supports use across a range of applications where heat resistance is a factor. The straight-cylindrical shank accepts standard drill chucks without adapters. The stub-length body offers greater rigidity than jobber-length bits, reducing deflection in short-hole drilling operations. Maximum drilling depth is 0.526 inches (13.35 mm), and the flute-to-diameter ratio is 3xD. This makes it appropriate for CNC machining centers, drill presses, and hand-held power tools used in production environments.

Key Features

• Cobalt tool material provides elevated heat resistance for demanding cutting cycles
• 118-degree four-facet split point reduces drill walking and lowers entry thrust
• Web-thinned tapered web improves chip flow and reduces cutting resistance
• DIN 1897 stub-length body increases rigidity and minimizes deflection
• Right-hand spiral flute with straight-cylindrical shank for universal chuck compatibility
• Diameter tolerance of +0.000 to -0.018 mm for consistent hole sizing

Compatibility

Designed as an OEM-specification replacement or new-installation stub-length drill bit for use in standard drill chucks accepting a 3.10 mm straight-cylindrical shank, conforming to DIN 1897.

Installation Notes

This bit is installed and used by machinists, toolmakers, and metalworking technicians. Secure the straight-cylindrical shank fully in the drill chuck and verify chuck key tightening before operation. Always use appropriate cutting fluid or coolant when drilling metal, even though this bit does not support through-coolant delivery. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or wear is observed.