Guhring 9006600002800 Micro Drill Bit 85 Cobalt Tin

Product Description

The GUHRING 9006600002800 is a wire gauge size 85 micro drill bit designed for precision drilling in tight-tolerance applications. Built from cobalt high-speed steel and finished with a TiN (titanium nitride) coating, it delivers extended tool life and improved heat resistance compared to standard HSS tooling. The drill measures 0.0110 inches in diameter and 0.9840 inches overall length, making it suited for shallow, small-diameter bore work. A 118-degree faceted point angle with web-thinned geometry reduces entry force and improves centering. Right-hand spiral flutes evacuate chips efficiently in the small bore. This tool is installed and used by machinists, toolmakers, and CNC operators working in production or job-shop environments.

The 9006600002800 is primarily rated for aluminum and non-ferrous materials, with secondary suitability for titanium alloys. It follows DIN 1899 specification, which governs short micro drills with straight-cylindrical shanks. The 5xD flute-to-diameter ratio and tapered web configuration make it appropriate for circuit board drilling, instrument component machining, medical device fabrication, and other applications requiring controlled micro-bore geometry. The straight-cylindrical shank diameter of 1.00 mm fits standard micro chuck collets and small precision drill chucks.

Key Features

• Wire gauge size 85, 0.0110 inch diameter with tight tolerance of +0.000 to -0.004 mm
• Cobalt substrate provides superior heat resistance over standard M2 HSS
• TiN coating reduces friction and increases surface hardness for longer tool life
• 118-degree faceted point with web thinning for accurate entry and reduced thrust force
• Right-hand regular spiral flute with 5xD ratio for efficient chip evacuation in shallow bores
• Conforms to DIN 1899 specification for short micro drills

Compatibility

Designed as an OEM-specification micro drill bit per DIN 1899 for use in precision drilling of aluminum, non-ferrous metals, and titanium alloys. Fits standard precision collet chucks and micro drill chucks accepting a 1.00 mm straight-cylindrical shank. Primary workpiece material codes K, M, N, and P cover cast iron, stainless, non-ferrous, and general steel; secondary material code S covers titanium and heat-resistant alloys.

Installation Notes

Micro drill bits at this diameter range should be mounted in a precision collet or drill chuck rated for the shank size to minimize runout. Confirm spindle runout is within acceptable tolerance before drilling, as excess runout accelerates breakage at sub-0.020-inch diameters. Always bring the spindle to full speed before contact with the workpiece and use appropriate cutting fluid or mist coolant for the workpiece material. Replace the tool at the first sign of point wear to avoid bore oversizing or tool breakage in the part.