Guhring 9055250040000 Extra Length Drill Bit 4mm Carbide

Product Description

The GUHRING 9055250040000 is a solid carbide extra length drill bit engineered for high-performance drilling in ferrous and non-ferrous materials. Built to DIN 6537 standards, it features a 140-degree facet point with web thinning for self-centering entry and reduced thrust. The FIREX coating improves wear resistance and thermal stability during extended cutting cycles. At 102 mm overall length with a 64 mm flute length and a 12xD depth-to-diameter ratio, this bit handles deeper hole applications that standard-length tooling cannot reach. Coolant-through capability supports chip evacuation and heat management in demanding operations. It is intended for use by machinists and tooling professionals working with CNC or manual drilling setups.

This drill bit is suited for production and job-shop environments where consistent hole quality in cast iron and steel is required. The submicron carbide grade and FIREX coating make it a reliable choice for interrupted cuts and high-cycle runs. Secondary workpiece material compatibility extends to aluminum and titanium alloys, covering a broad range of shop applications. The straight-cylindrical shank fits standard drill chucks and collet systems without modification, keeping setup time low on both vertical machining centers and drill presses.

Key Features

• Solid submicron carbide construction for rigidity and edge retention in hard materials
• FIREX coating provides thermal and wear resistance across extended run cycles
• 140-degree standard point with web thinning and facet point grinding for self-centering performance
• Coolant-through design supports chip evacuation and heat control at depth
• 12xD flute-to-diameter ratio enables drilling up to 58 mm deep in a single pass
• Right-hand spiral flute with tapered web configuration for consistent chip formation

Compatibility

Primary workpiece materials are cast iron and steel (ISO material codes K and P). Secondary workpiece materials include aluminum and titanium alloys (ISO codes H, M, N, and S). Designed as an OEM-style tooling solution for shops running DIN 6537 series tooling in standard drill chucks or collet holders.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling requirements. Ensure the spindle and workpiece are fully secured before initiating the cut. Confirm coolant lines are connected and flowing before drilling if using the through-coolant feature, as running dry with carbide tooling at depth accelerates wear. Follow machine manufacturer guidelines for speed and feed settings appropriate to the workpiece material and hole depth.