Guhring 9005020039000 Extra Length Drill Bit 3.9mm Hss

Product Description

The GUHRING 9005020039000 is an extra length high-speed steel drill bit designed for deep hole drilling applications in metalworking and machining environments. Built to DIN 1869 standards, it features a 3.9 mm diameter with a 130-degree point angle and a parabolic flute geometry that promotes efficient chip evacuation at extended depths. The overall length of 175 mm and a 120 mm flute length give this bit a 15xD flute-to-diameter ratio, making it well suited for holes that standard-length bits cannot reach. A nitride finish provides surface hardness without an applied coating that could alter final dimensions. This bit is installed and used by machinists and tool-and-die professionals working on production or maintenance drilling operations.

This drill bit is intended for deep hole drilling in aluminum and similar non-ferrous and general-purpose workpiece materials, covering material codes K, N, and P. The straight-cylindrical shank with a 55 mm shank length seats directly into standard drill chucks and collet holders without adapters. The parabolic flute design and web-thinned, tapered web configuration reduce thrust force at the point and help maintain chip flow across the full 114.15 mm maximum drilling depth. It is appropriate for CNC machining centers, drill presses, and manual production drilling setups where extended reach and hole straightness are required.

Key Features

• 3.9 mm diameter with a tolerance of +0.000 to -0.018 mm for precise hole sizing
• 130-degree standard point angle with web thinning reduces entry thrust and centering drift
• Parabolic flute profile supports chip evacuation in deep hole applications up to 114.15 mm depth
• 15xD flute-to-diameter ratio enables extended reach not achievable with jobber-length bits
• Nitride surface treatment adds hardness while maintaining dimensional accuracy
• Built to DIN 1869 specification, Series 502, for consistent dimensional and performance standards

Compatibility

Designed as an OEM-specification replacement or direct-use extra length drill bit for deep hole drilling setups requiring a 3.9 mm straight-cylindrical shank tool conforming to DIN 1869 Series 502 standards.

Installation Notes

This bit is installed by machinists using standard drill chucks or collet holders sized for a 3.9 mm straight-cylindrical shank. Ensure the machine spindle is fully stopped and the workpiece is securely fixtured before tool changes. Use appropriate cutting fluid or mist coolant for aluminum and non-ferrous materials to maintain tool life at extended drilling depths. Do not exceed the rated maximum drilling depth of 114.15 mm in a single pass without a peck-drilling cycle to clear chips.