Guhring 9055200120000 Cobalt Stub Drill Bit 12mm

Product Description

The GUHRING 9055200120000 is a cobalt stub-length drill bit engineered for high-performance drilling in demanding shop and production environments. Built to DIN 1897 standards, this Series 5520 bit features a 12.00 mm (0.4724 inches) diameter, a 118-degree four-facet split point, and a web-thinned tapered web for reduced thrust and clean entry. The two-flute spiral configuration with a regular helix promotes efficient chip evacuation. At 102.00 mm overall length with a 51.00 mm flute length, the stub format provides added rigidity, making it well suited for machinists and toolmakers working in tight-clearance setups or on drill press and CNC operations requiring precise hole location.

This drill bit is designed for use in metalworking applications where a shorter, stiffer tool reduces deflection and improves hole accuracy. The cobalt construction gives it the heat resistance needed for harder alloys, and the primary listed workpiece material is aluminum, though the cobalt substrate handles a range of materials encountered in general machining. The straight-cylindrical shank fits standard drill chucks and collet holders, making it compatible with common production machinery. It ships individually and is packaged as a single unit.

Key Features

• DIN 1897 stub length for increased rigidity and reduced deflection
• Cobalt tool material for elevated heat resistance during high-speed or hard-material drilling
• 118-degree four-facet split point reduces walking and lowers entry thrust
• Web-thinned tapered web improves cutting efficiency at the tip
• Two-flute regular spiral design promotes chip clearing throughout the cut
• Straight-cylindrical shank fits standard drill chucks and collet holders without modification

Compatibility

Designed as a DIN 1897-standard stub-length drill bit suitable for use in drill presses, machining centers, and CNC equipment fitted with standard drill chucks or collet systems accepting a 12.00 mm straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with rotating cutting tool safety. Secure the shank fully in the chuck or collet and verify runout before drilling. Ensure the workpiece is firmly fixtured before engaging the spindle. Follow applicable shop safety standards and machine manufacturer guidelines for spindle speed and feed rate selection.