Guhring 9055200090000 Cobalt Stub Drill Bit 9mm

Product Description

The GUHRING 9055200090000 is a cobalt stub-length (screw machine length) drill bit designed for high-performance drilling in demanding shop and field applications. Built to DIN 1897 standards, this 9mm (0.3543 inches) diameter bit features a 118-degree four-facet split point with web thinning for fast, accurate entry and reduced thrust requirements. The two-flute spiral design moves chips efficiently, while the cobalt construction provides added heat resistance compared to standard high-speed steel. Licensed machinists, tool-and-die technicians, and industrial maintenance mechanics are the primary installers and users of this tooling.

This bit is suited for drilling aluminum as its primary workpiece material, though the cobalt construction handles a range of ferrous and non-ferrous stock in production and maintenance environments. The stub-length body (overall length 84mm, approximately 3.31 inches) provides increased rigidity over jobber-length bits, making it a reliable choice for short-hole work, CNC setups, and manual drill press operations where chatter and deflection must be minimized. Maximum drilling depth is 1.043 inches (26.50mm), consistent with the 3xD flute-to-diameter ratio.

Key Features

• Cobalt construction for improved heat and wear resistance over standard HSS
• 118-degree four-facet split point with web thinning reduces thrust and improves centering
• Stub-length body (3.31 inches overall) for increased rigidity and reduced deflection
• DIN 1897 standard geometry ensures consistent, repeatable performance
• Straight-cylindrical shank fits standard drill chucks without adapters
• Right-hand cut, regular spiral flute for efficient chip evacuation

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit suitable for use in standard drill chucks, CNC machining centers, and drill presses accepting 9mm straight-cylindrical shanks. Fits drill bit size range 0.3500 to 0.4000 decimal inch (8.00 to 9.50mm) toolholding systems.

Installation Notes

Install in a properly sized drill chuck or collet, ensuring the shank is fully seated and the chuck key is removed before operation. Verify spindle speed is appropriate for the workpiece material and bit diameter before starting the cut. Coolant-through is not supported on this bit; apply cutting fluid externally as needed when drilling ferrous materials. Inspect the cutting edges and web thinning area for wear before reuse, and regrind or replace when point geometry degrades to maintain hole quality and prevent bit breakage.