Guhring 9055200066000 Cobalt Stub Drill Bit 0.2598 in

Product Description

The GUHRING 9055200066000 is a cobalt screw machine (stub) length drill bit designed for high-speed drilling in demanding production and maintenance environments. Built to DIN 1897 standards, it features a 118-degree four-facet split point geometry that reduces walking and improves hole entry accuracy. The web-thinned, tapered web design lowers thrust requirements, making it well suited for hand-held and machine-mounted drilling operations. At 0.2598 inches (6.60 mm) in diameter with a straight-cylindrical shank, this bit fits standard drill chucks without adapters. It is typically installed by machinists, maintenance mechanics, and industrial trade professionals.

This stub-length drill bit is engineered for short-reach applications where rigidity and precision matter more than depth. The 6.60 mm diameter and 3xD flute-to-diameter ratio make it effective in aluminum and similar non-ferrous materials. With an overall length of 70.00 mm (approximately 2.76 inches) and a flute length of 31.00 mm (approximately 1.22 inches), it fits compact drill presses, CNC machines, and hand drills. Maximum drilling depth reaches 0.8310 inches (21.10 mm).

Key Features

• Cobalt tool material for elevated heat resistance and extended tool life
• 118-degree four-facet split point reduces thrust and prevents bit walking
• Web-thinned tapered web lowers cutting resistance in production drilling
• DIN 1897 stub length provides greater rigidity than jobber-length bits
• Right-hand spiral flute with 3xD ratio clears chips effectively in aluminum
• Straight-cylindrical shank fits standard drill chucks without sleeves or adapters

Compatibility

Designed as an OEM-style replacement or direct-use stub-length drill bit for Series 5520 applications; suitable for use in drill presses, CNC machining centers, and hand drills accepting a 6.60 mm straight-cylindrical shank. Drill bit size range covers 0.2500 to 0.3000 inches (6.50 to 8.00 mm) class tooling.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before operation. Confirm spindle speed and feed rate are appropriate for the workpiece material before beginning the cut. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is observed.