Guhring 9055250107200 Extra Length Drill Bit Solid Carbide

Product Description

The GUHRING 9055250107200 is a solid carbide extra length drill bit designed for high-performance drilling in demanding industrial and metalworking applications. Part of the Series 5525 line, it carries a 0.4219-inch diameter with a 140-degree drill point angle and FIREX coating for extended tool life and heat resistance. The two-flute spiral design runs through-coolant capability, making it well-suited for deep-hole drilling in tight tolerances. With a flute-to-diameter ratio of 12xD and a maximum drilling depth of 134.00 mm, this bit handles applications where standard-length tooling falls short. Machinists and tool-and-die professionals specify this bit when process reliability and dimensional accuracy are critical.

This drill bit is suited for production and job-shop environments running CNC machining centers, drill presses, and multi-axis equipment. Primary workpiece materials include cast iron and steel. Secondary applications cover aluminum and titanium alloys. The web-thinned, tapered web configuration and self-centering facet point reduce entry thrust and improve hole location accuracy. It is a strong choice for aerospace, automotive, mold-and-die, and general precision machining where hole depth and finish requirements exceed the capability of standard-length carbide drills.

Key Features

• FIREX coating provides thermal and wear resistance for extended tool life in ferrous and non-ferrous materials
• Through-coolant construction directs fluid to the cutting edge for chip evacuation and heat control during deep-hole operations
• 140-degree point angle with standard point type and facet point grinding for accurate self-centering entry
• Web-thinned tapered web reduces thrust load and minimizes work-hardening at entry
• 12xD flute-to-diameter ratio enables drilling depths up to 134.00 mm in a single pass
• Straight-cylindrical shank at 12.00 mm diameter fits standard ER and hydraulic toolholders

Compatibility

Designed for use in CNC machining centers and drill presses accepting a 12.00 mm straight-cylindrical shank. Meets DIN 6537 dimensional standards. Primary workpiece materials are cast iron and steel; secondary workpiece materials include aluminum and titanium alloys.

Installation Notes

This bit is installed and serviced by machinists or tool crib personnel familiar with carbide tooling procedures. Ensure the spindle and toolholder are fully powered down and locked out before changing tooling. Use a properly sized collet or hydraulic chuck matched to the 12.00 mm shank diameter to prevent runout. Carbide tooling is brittle — avoid side-loading or interrupted cuts beyond the tool's rated application range.