Guhring 9055240083300 Cobalt Stub Drill Bit 21/64

Product Description

The GUHRING 9055240083300 is a cobalt stub-length (screw machine length) drill bit designed for high-speed, high-feed drilling in metalworking and machining applications. Built to DIN 1897 standards, it features a 118-degree four-facet split point and web-thinned tapered web for reduced thrust and cleaner hole entry. The M35 cobalt steel construction provides heat resistance and edge retention when drilling tough materials. At 0.3281 inches (21/64 inch) in diameter with an overall length of approximately 3.11 inches, this bit is sized for short-reach, rigid setups common in screw machine and CNC drilling operations. Installation and setup are performed by machinists and tool-and-die professionals.

This drill bit is suited for drilling aluminum and similar non-ferrous and ferrous materials in production machining environments. Its stub-length body reduces deflection and promotes accuracy in short, precise holes. The 3xD flute-to-diameter ratio and spiral flute design provide efficient chip evacuation. A maximum drilling depth of 0.9650 inches makes it appropriate for shallow-to-moderate depth holes in tight workpiece setups. It is sold individually and is appropriate for use in CNC machining centers, manual drill presses, and screw machines.

Key Features

• M35 cobalt steel construction for heat resistance and extended tool life in demanding materials
• 118-degree four-facet split point with web thinning reduces entry thrust and improves centering
• Stub-length (DIN 1897) body minimizes deflection for rigid, accurate drilling
• Spiral flute with 3xD ratio promotes efficient chip evacuation
• Bright/uncoated finish suitable for use with cutting fluids on aluminum and similar materials
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit compatible with standard straight-shank drill chucks and collets accepting an 8.33 mm shank diameter across CNC and manual drilling equipment.

Installation Notes

This bit is installed and changed by machinists or tooling technicians using standard chuck keys or collet wrenches with the machine powered down and locked out per OSHA lockout/tagout procedures. Ensure the chuck or collet is rated for the shank diameter before seating the bit. Use appropriate cutting fluid for the workpiece material to extend tool life. Do not exceed the recommended maximum drilling depth of 0.9650 inches for this stub-length geometry.