Guhring 9005520120000 Stub Drill Bit 12mm Hss

Product Description

The GUHRING 9005520120000 is a screw machine length (stub) drill bit designed for high-performance drilling in aluminum and other non-ferrous materials. Built to DIN 1897 standards from high speed steel with a bright, uncoated finish, this bit features a parabolic flute geometry and a web-thinned tip that reduces thrust and promotes efficient chip evacuation. The 130-degree point angle is optimized for softer materials. With a 12mm (0.4724-inch) diameter and a compact overall length of 4.0157 inches, it is well suited for CNC machining centers, drill presses, and screw machine operations where rigidity and precision are priorities.

This stub-length drill bit is used in production and job-shop environments where shorter flute length provides added stability and reduced deflection. The straight cylindrical shank fits standard drill chucks without modification. Its 3xD flute-to-diameter ratio and parabolic flute design handle chip flow efficiently during moderate to high-speed drilling cycles. It is a single-bit unit intended for professional machinists and toolroom technicians.

Key Features

• 12mm (0.4724-inch) diameter with a tight tolerance of +0.000 to -0.027 mm for precision fitment
• Parabolic flute with web-thinned, parallel web design for efficient chip evacuation and reduced entry force
• 130-degree point angle optimized for aluminum and non-ferrous primary workpiece materials
• Stub (screw machine) length at 4.0157 inches overall for maximum rigidity in short-reach applications
• Manufactured to DIN 1897 specification for consistent geometry and interchangeability
• High speed steel construction rated as high performance grade with bright, uncoated finish

Compatibility

Designed as a DIN 1897-compliant stub-length drill bit for use with standard straight-shank drill chucks in CNC machining, screw machine, and drill press setups. Primary workpiece material is aluminum; suitable for other non-ferrous materials with appropriate speeds and feeds.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Secure the straight cylindrical shank fully and evenly in the drill chuck before operation and verify runout before starting a cut. Power down and lock out the machine before changing tooling. Do not exceed the maximum drilling depth of 1.299 inches per pass without retracting to clear chips.