Guhring 9005520063000 Stub Drill Bit 0.248 in Hss

Product Description

The GUHRING 9005520063000 is a screw machine length (stub) drill bit designed for high-performance drilling in aluminum and other materials where a short, rigid cutting tool is required. Built from high speed steel with a bright uncoated finish, this Series 552 bit features a parabolic flute geometry and a web-thinned parallel web for efficient chip evacuation and reduced thrust. The 130-degree point angle suits flat-entry drilling without walking. At 2.756 inches overall length with a 1.2205-inch flute, it fits standard drill chucks and CNC spindles alike. The straight-cylindrical shank and DIN 1897 construction deliver consistent runout and repeatable hole quality in production environments.

This bit is sized at 0.248 inches (6.30 mm) diameter with a maximum drilling depth of 0.848 inches. The stub length body reduces deflection in short-reach applications — typical install scenarios include screw machine operations, production drilling fixtures, and CNC machining centers where rigidity and cycle time matter. The parabolic flute design is particularly well suited for aluminum, promoting clean chip clearing without packing. Right-hand cut configuration is standard for conventional spindle rotation. The 3xD flute-to-diameter ratio supports controlled depth in shallow-hole applications.

Key Features

• High speed steel construction with bright uncoated finish for general-purpose and aluminum drilling
• Parabolic flute geometry promotes fast chip evacuation and reduced heat buildup
• Web-thinned parallel web lowers thrust and improves penetration efficiency
• 130-degree point angle provides stable flat entry and reduced walking tendency
• DIN 1897 stub length standard — shorter body increases rigidity and reduces deflection
• Diameter tolerance of +0.000 to -0.022 mm for consistent, repeatable hole sizing

Compatibility

Designed as a DIN 1897 Series 552 stub drill bit with a straight-cylindrical shank; fits standard drill chucks, collet holders, and CNC tooling systems accepting a 0.248-inch shank diameter. Primary workpiece material designation is aluminum, though HSS construction supports use in a range of non-hardened metals and plastics.

Installation Notes

Installation and use of this drill bit is performed by machinists, tool-and-die technicians, and CNC operators. Ensure the spindle and chuck are fully stopped and de-energized before inserting or removing the bit. Verify chuck or collet runout before production runs to stay within the specified diameter tolerance. Do not exceed the rated maximum drilling depth of 0.848 inches per pass without retracting to clear chips.