Guhring 9085100067500 Drill Bit Letter H Solid Carbide

Product Description

The GUHRING 9085100067500 is a screw machine length solid carbide drill bit in Letter H size (0.2657 inches decimal equivalent). Built to DIN 6537 K standards and finished with GUHRING nano-A multi-layer coating, it is engineered for high-performance drilling in demanding materials. The bit features a 140-degree facet point, web thinning for reduced thrust, and coolant-through capability to manage heat in difficult cuts. Overall length is 3.1102 inches (79.00 mm), with a 8.00 mm straight-cylindrical shank. Licensed machinists, tool-and-die tradespeople, and precision metalworking shops are the primary installers of this bit.

This drill bit is designed for drilling stainless steel and high-temperature alloys where standard high-speed steel tooling falls short. The screw machine length geometry keeps the tool compact and rigid for use in CNC machining centers, drill presses, and manual machines requiring short, stiff tooling. The 3xD flute-to-diameter ratio suits the maximum drilling depth of 0.9400 inches (23.88 mm) typical in these applications. Its right-hand spiral flute and regular spiral type make it a direct fit for standard right-hand spindle setups in production and job shop environments.

Key Features

• Letter H size — 0.2657 inch decimal equivalent, DIN 6537 K standard
• Solid carbide construction with nano-A multi-layer coating for extended tool life in hard materials
• 140-degree facet point with web thinning reduces entry thrust and improves centering
• Coolant-through design channels coolant directly to the cutting edge for heat management
• Screw machine length (79.00 mm OAL) provides rigidity for precision drilling
• Right-hand cut, regular spiral flutes, straight-cylindrical 8.00 mm shank

Compatibility

Designed for use in stainless steel and high-temperature alloy drilling applications per GUHRING Series 8510 specifications, with a shank diameter of 8.00 mm suitable for standard collets and drill chucks accepting that size.

Installation Notes

Installation and use of solid carbide drill bits should be performed by qualified machinists familiar with proper speeds, feeds, and coolant requirements for carbide tooling. Ensure the machine spindle is fully stopped and the workpiece is securely clamped before tool changes. Inspect the shank and chuck or collet for runout before use, as excessive runout accelerates carbide wear and can cause fracture. Coolant-through toolpaths require a machine with internal coolant delivery to realize the full performance benefit of this bit.