Guhring 9055200080300 Cobalt Stub Drill Bit 8.03mm

Product Description

The GUHRING 9055200080300 is a cobalt stub-length drill bit designed for high-performance drilling in demanding shop and field applications. Built to DIN 1897 specifications, it measures 8.03 mm in diameter with an overall length of 79.00 mm and a flute length of 37.00 mm. The 118-degree four-facet split point geometry reduces walking and cutting force at entry, while the web-thinned, tapered web configuration improves chip evacuation. Two spiral flutes with a 3xD flute-to-diameter ratio support controlled chip flow. The straight-cylindrical shank seats securely in standard drill chucks. At 0.051 pounds, it is lightweight and easy to handle during extended use. Licensed machinists, toolmakers, and metalworking professionals are the primary installers.

This stub-length drill bit is suited for applications requiring a short, rigid tool with reduced deflection in tight clearances or multi-axis setups. The cobalt construction supports drilling into aluminum, which is listed as the primary workpiece material, as well as other non-ferrous and moderate ferrous materials where heat resistance is a factor. The Letter O size designation corresponds to a decimal diameter of 0.3160 inches. The maximum drilling depth is 0.9830 inches (24.96 mm), making it appropriate for through-hole and shallow blind-hole work. Series 5520 identifies the product family within the GUHRING catalog.

Key Features

• Cobalt tool material provides elevated heat and wear resistance compared to standard HSS
• 118-degree four-facet split point reduces center walking and entry thrust force
• Web-thinned tapered web improves chip clearance and reduces torque demand
• DIN 1897 stub-length geometry delivers greater rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute configuration compatible with standard drill press and CNC spindle setups
• Diameter tolerance held to +0.000 to -0.022 mm for consistent hole quality

Compatibility

Designed as an OEM-style replacement and standard production drill bit for metalworking applications conforming to DIN 1897 stub-length specifications. Compatible with any standard drill chuck or collet accepting an 8.03 mm straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or toolroom professionals using a drill press, lathe tailstock, or CNC machining center. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits. Always use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole tolerance. Inspect the cutting edges before each use and replace if chipping or excessive wear is observed.