Guhring 9055240027000 Cobalt Stub Drill Bit 2.70mm

Product Description

The GUHRING 9055240027000 is a cobalt stub-length (screw machine length) twist drill bit designed for precision drilling in metalworking and light industrial applications. Built to DIN 1897 standards, this 2.70 mm diameter bit features a 118-degree four-facet split point and a web-thinned, tapered web configuration that reduces entry force and improves centering. The bright, uncoated cobalt construction provides heat resistance and edge retention well beyond standard high-speed steel. With an overall length of 46 mm (1.811 inches) and a maximum drilling depth of 11.95 mm (0.469 inches), this stub-series bit delivers rigid, chatter-free performance in short-reach drilling setups. Machinists and tool-and-die technicians are the primary users.

The 9055240027000 is suited for drilling aluminum and similar non-ferrous and softer ferrous materials in production and maintenance environments. Its straight cylindrical shank at 2.70 mm diameter seats directly in standard drill chucks and collet systems without adapters. The 16 mm spiral flute length and 3xD flute-to-diameter ratio keep chips moving efficiently, making this bit a practical choice for CNC machining centers, drill presses, and hand-held power tools where a compact stub-length profile is required to minimize deflection and maximize positional accuracy.

Key Features

• Cobalt tool material for elevated heat resistance and wear life compared to standard HSS
• 118-degree four-facet split point with web thinning for reduced thrust and self-centering entry
• DIN 1897 stub-length design provides a rigid, low-deflection profile
• Bright uncoated finish compatible with cutting fluids and oils without coating interaction concerns
• Regular spiral flute geometry with tapered web configuration promotes efficient chip evacuation
• Diameter tolerance of +0.000 to -0.014 mm for consistent hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement or direct-use drill bit for applications requiring a 2.70 mm (0.1063 inch) diameter hole in aluminum and comparable workpiece materials. Fits any standard drill chuck or collet accepting a 2.70 mm straight cylindrical shank.

Installation Notes

This bit is installed by a machinist or maintenance technician in a drill chuck or collet rated for the 2.70 mm shank diameter. Ensure the machine spindle is fully stopped and de-energized before changing tooling. Secure the shank to the full recommended grip depth in the chuck or collet to prevent pullout during drilling. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole tolerance.