Guhring 9055200019800 Cobalt Stub Drill Bit 5/64 in

Product Description

The GUHRING 9055200019800 is a cobalt screw machine length (stub) drill bit designed for high-speed drilling in demanding shop and field applications. It measures 5/64 inch (0.0781 inch decimal) in diameter with an overall length of 1.4173 inches and a flute length of approximately 0.433 inches. The 118-degree four facet split point geometry promotes accurate entry and reduces walking on startup. The web-thinned, tapered web construction reduces cutting thrust, making this bit well suited for production drilling environments where cycle time and tool life both matter. Licensed machinists, tool-and-die techs, and maintenance professionals are the typical users.

This drill bit is built for stub-length applications where rigidity matters more than reach, such as close-tolerance work in fixtures, multi-spindle setups, and tight-clearance drilling. The Series 5520 designation follows DIN 1897 standards. Primary workpiece material is listed as aluminum, though the cobalt construction also handles harder materials that would wear out standard HSS bits. The straight-cylindrical shank fits standard drill chucks without adaptation. Maximum drilling depth is 0.356 inch (9.03 mm), consistent with a 3xD flute-to-diameter ratio.

Key Features

• Cobalt tool material for improved heat resistance and tool life versus standard HSS
• 118-degree four facet split point with web thinning for reduced thrust and accurate positioning
• Stub (screw machine) length per DIN 1897 for maximum rigidity in short-reach applications
• Right-hand cutting, regular spiral flute, straight-cylindrical shank
• Diameter tolerance held to +0.000 to -0.014 mm for consistent hole sizing
• No coolant-through requirement — suitable for dry or flood-coolant setups

Compatibility

Designed as a DIN 1897 Series 5520 stub drill bit fitting standard straight-cylindrical chuck systems; consult tooling setup documentation for spindle speed and feed recommendations specific to the workpiece material.

Installation Notes

Installation is performed by qualified machinists or maintenance technicians using a standard drill chuck or collet system. Ensure the shank is fully seated and the chuck is tightened securely before operation. Power down and lock out the spindle before changing bits. Do not exceed the rated maximum drilling depth of 0.356 inch per pass without retracting to clear chips.