Guhring 9005520063500 Drill Bit Letter E 0.2500 in Hss

Product Description

The GUHRING 9005520063500 is a screw machine length (stub) drill bit designed for high-performance drilling in production and shop environments. Built from high-speed steel (HSS) with a bright, uncoated finish, this bit features a 130-degree cone relief point and a parabolic flute geometry that promotes fast chip evacuation and reduced heat buildup. It carries a Letter E designation, corresponding to a 0.2500-inch diameter, with an overall length of 2.75 inches and a maximum drilling depth of 0.846 inches. The shorter stub length increases rigidity and reduces deflection, making it well suited for accurate hole-starting in CNC machines, drill presses, and screw machine applications.

This drill bit is intended for use in metal fabrication, machining, and production drilling operations. Its parabolic flute design and web-thinned point are optimized for cutting steel, aluminum, and other non-ferrous materials. The straight cylindrical shank at 0.2500 inches in diameter fits standard drill chucks without modification. The 3xD flute-to-diameter ratio and parallel web configuration make this bit reliable for repetitive, high-cycle drilling tasks in both job shop and production floor settings. It is sold individually.

Key Features

• Letter E (0.2500 inch) diameter with a diameter tolerance of +0.000 to -0.022 mm for consistent hole sizing
• 130-degree cone relief point reduces thrust force and improves self-centering on entry
• Parabolic fast-spiral flutes promote efficient chip evacuation and reduce heat in deep cuts
• Web-thinned design lowers cutting resistance and extends tool life in steel and non-ferrous materials
• Stub length (2.75 inches OAL) increases rigidity and minimizes deflection compared to jobber-length bits
• Meets DIN 1897 specification for consistent dimensional quality

Compatibility

Designed as a DIN 1897 Series 552 stub-length drill bit compatible with standard 0.2500-inch straight-shank drill chucks. Suitable for drilling steel, aluminum, and non-ferrous workpiece materials.

Installation Notes

Installation is performed by machinists or tool-and-die technicians using a standard keyed or keyless drill chuck rated for the 0.2500-inch shank diameter. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck runout before use to maintain hole-diameter tolerance, and apply appropriate cutting fluid for the workpiece material to extend tool life and protect the uncoated HSS surface.