Guhring 9064000028500 Micro Drill Bit 2.85mm Carbide

Product Description

The GUHRING 9064000028500 is a solid carbide micro drill bit engineered for precision hole-making in demanding metalworking applications. Built to Series 6400 specifications, it features a 2.85 mm diameter, a 140-degree faceted point, and a TiAlN coating that extends tool life at elevated cutting temperatures. The spiral flute geometry with web thinning promotes efficient chip evacuation and reduces thrust force at entry. At 59 mm overall length with a 17.10 mm flute length and a maximum drilling depth of 13.60 mm, this bit is sized for tight-tolerance micro-drilling work performed by machinists and tooling specialists in production and job-shop environments.

This drill bit is rated for primary use in cast iron, stainless steel, and carbon and alloy steels, with secondary capability in aluminum and titanium alloys. The straight-cylindrical shank at 4.00 mm diameter seats securely in standard collet chucks and drill chucks. Its 4xD flute-to-diameter ratio makes it well suited for through-hole and blind-hole drilling in CNC machining centers and drill presses where consistent diameter tolerance and surface finish are critical.

Key Features

• Solid carbide K40 grade construction for rigidity and wear resistance in hard and abrasive materials
• TiAlN coating provides thermal protection and extends service life in ferrous and exotic alloy cutting
• 140-degree faceted point reduces walking and delivers accurate hole entry without a center drill
• Web-thinned geometry lowers cutting thrust and improves chip clearance in deep micro holes
• Right-hand spiral flute, right-hand cut - compatible with standard CNC and manual spindle rotation
• Straight-cylindrical 4.00 mm shank fits common collet and keyless chuck systems

Compatibility

Designed as a Series 6400 micro drill for use in cast iron, stainless steel, and steel as primary workpiece materials, with aluminum and titanium alloy as secondary workpiece materials. The m7 diameter tolerance class is suited for close-tolerance production drilling applications.

Installation Notes

Installation and tool changes must be performed with the spindle fully stopped and the machine locked out per standard shop safety procedures. Seat the straight-cylindrical shank fully and concentrically in the collet or chuck to minimize runout, which is critical at this diameter. Consult the machine tool manufacturer and GUHRING cutting data guidelines for appropriate feed rate and spindle speed for the specific workpiece material. Coolant-through is not supported on this bit; external coolant or mist lubrication should be applied at the cutting zone where the operation allows.