Guhring 9055250068000 Extra Length Drill Bit 6.8mm Carbide

Product Description

The GUHRING 9055250068000 is a solid carbide extra length drill bit designed for high-performance drilling in ferrous and non-ferrous metals. Built to DIN 6537 standards, it features a 6.8 mm diameter, a 140-degree standard point angle, and FIREX coating for extended tool life under demanding cutting conditions. The submicron carbide grade provides hardness and edge retention beyond conventional grades. With a flute-to-diameter ratio of 12xD and a maximum drilling depth of 97.80 mm, this bit handles deep-hole operations that standard-length drills cannot reach. It is installed by machinists and tool-and-die professionals in CNC machining centers and manual drill presses.

This drill bit is suited for production and job-shop environments where precise, repeatable deep-hole drilling is required. Primary workpiece materials include cast iron and steel (ISO material codes K and P). Secondary applications cover aluminum, titanium alloy, and other aerospace-grade materials (ISO codes H, M, N, and S). The web-thinned, tapered web configuration and self-centering facet point geometry reduce entry force and improve chip evacuation. Coolant-through capability allows internal coolant delivery, making it effective in high-speed, high-feed operations where heat management is critical.

Key Features

• Solid submicron carbide construction for superior edge retention in hard materials
• FIREX coating extends tool life and reduces friction during cutting
• 140-degree standard point with facet point grinding for self-centering entry
• Coolant-through design supports internal coolant delivery for deep-hole drilling
• Web-thinned tapered web reduces thrust force and improves chip flow
• 12xD flute-to-diameter ratio with 108 mm flute length for extended reach
• Right-hand cutting, spiral flute, straight-cylindrical shank for broad machine compatibility

Compatibility

Designed for use in CNC machining centers and drill presses accepting straight-cylindrical shank tooling with a 0.3150-inch (8 mm nominal) shank diameter. Conforms to DIN 6537 specifications for extra length drill bits. Suitable for cast iron, steel, aluminum, and titanium alloy workpieces per ISO material codes K, P, H, M, N, and S.

Installation Notes

Install in a compatible collet chuck or drill chuck rated for the 0.3150-inch shank diameter and verify runout before cycling. Ensure the machine spindle is fully stopped and the tool holder is properly torqued before inserting or removing the bit. Enable coolant-through supply when drilling at full depth to maintain chip evacuation and prevent heat buildup. This product is subject to California Proposition 65 requirements — follow applicable workplace safety guidelines when machining materials that may produce hazardous dust or fumes.