Guhring 9005300059400 Jobber Drill Bit Letter a Firex

Product Description

The GUHRING 9005300059400 is a jobber length drill bit designed for high-performance drilling in ferrous materials. It measures letter size A, equivalent to 0.2339 inches in diameter, and is manufactured from powdered metal with a FIREX coating for extended tool life and heat resistance. The bit features a 130-degree drill point angle with cone relief geometry and a parabolic flute design that promotes fast chip evacuation. Overall length is 3.66 inches (93 mm), and the straight-cylindrical shank is 5.94 mm in diameter. This bit is built to DIN 338 standards and carries an h8 diameter tolerance, making it suitable for precision hole work in production and maintenance environments.

This drill bit is intended for drilling cast iron and steel in both production shop and field maintenance applications. The fast spiral parabolic flute, rated at a 5xD flute-to-diameter ratio, supports deeper hole drilling with reduced chip packing. The web-thinned point reduces entry force and improves centering. It is well suited for use with CNC machining centers, drill presses, and handheld power tools where consistent hole size and surface finish are required in metal fabrication or repair work. Licensed machinists, tool and die technicians, and maintenance mechanics are the typical end users.

Key Features

• Letter A size (0.2339 inches) with h8 diameter tolerance for precise hole sizing
• FIREX coating provides oxidation and wear resistance during high-speed drilling
• 130-degree cone relief point angle reduces thrust force on entry
• Parabolic fast-spiral flute design improves chip evacuation in deep holes
• Web-thinned construction lowers cutting resistance and extends tool life
• Complies with DIN 338 standard for jobber length drill bits

Compatibility

Designed as an OEM-style replacement or direct substitute for jobber length drill bits conforming to DIN 338 specifications in letter size A. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck or collet sized to accept a 5.94 mm straight-cylindrical shank. Secure the bit fully in the chuck and verify runout before drilling. Power down and de-energize any CNC or automatic feed equipment before inserting or removing the bit. Observe applicable shop safety standards and wear appropriate eye protection when operating.