Guhring 9055110093400 Carbide Drill Bit Letter U Firex

Product Description

The GUHRING 9055110093400 is a solid carbide jobber-length drill bit sized to Letter U (0.3677 inches) with a 140-degree split-point angle and FIREX coating. It is designed for high-performance drilling in cast iron and steel in manufacturing, machining, and metalworking applications. The FIREX coating reduces friction and extends tool life in demanding production environments. The web-thinned SU point is self-centering, which reduces the need for a center punch and improves hole entry accuracy. Coolant-through capability allows internal coolant delivery directly to the cutting edge, keeping temperatures low during deep-hole operations. Licensed machinists and CNC operators are the primary users of this tooling.

This drill bit is built for production drilling in ferrous metals, specifically cast iron and steel. It suits CNC machining centers, drill presses, and manual mills where consistent hole quality and tool life are priorities. The straight-cylindrical shank (10.00 mm diameter) fits standard drill chucks and collet holders commonly found in machine shops. With a flute-to-diameter ratio of 5xD and a maximum drilling depth of 46.99 mm (approximately 1.85 inches), it handles moderate-depth holes in one pass without peck drilling in most steel applications.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• FIREX coating reduces friction and extends cutting life in cast iron and steel
• 140-degree SU self-centering point eliminates need for center-punching
• Coolant-through design delivers internal coolant directly to the cutting zone
• Web-thinned geometry reduces thrust force at entry
• Straight-cylindrical shank compatible with standard chucks and collet systems

Compatibility

Intended for use in cast iron and steel workpieces. Straight-cylindrical shank fits standard drill chucks and collet holders accepting a 10.00 mm shank diameter. Conforms to DIN 6535 and DIN 6537 L standards. Part of GUHRING Series 5511.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with carbide tooling. Ensure the machine spindle and chuck or collet are clean and properly seated before securing the shank. Carbide tooling is brittle — avoid side-loading or using this bit in hand-held drills. Enable coolant flow before engaging the cut when using the through-coolant feature, and verify coolant pressure is compatible with the machine spindle.