Guhring 9003010002100 Micro Drill Bit Wire 91 Cobalt

Product Description

The GUHRING 9003010002100 is a cobalt micro drill bit engineered for precision drilling in small-diameter applications. It carries a wire gauge size of 91, corresponding to a decimal diameter of 0.0083 inches, with an overall length of 0.984 inches. The 118-degree faceted point geometry provides accurate entry and reduces walking on entry into hard or abrasive workpiece materials. The spiral flute design promotes chip evacuation in shallow-depth bores, and the web-thinned, tapered web configuration reduces thrust force at the cutting tip. This bit is intended for use by machinists, tool-and-die specialists, and precision sheet metal fabricators working with tight-tolerance micro-diameter holes.

This drill bit is rated primarily for aluminum and non-ferrous materials, with secondary suitability for titanium alloys. It conforms to DIN 1899 specification, which governs short-flute micro drills. The straight-cylindrical shank with a 1.00 mm shank diameter is compatible with standard micro drill chucks and collet-style tool holders commonly used on CNC machining centers, benchtop drill presses, and precision hand drilling fixtures. Maximum recommended drilling depth is 0.047 inches (1.19 mm), reflecting the 5xD flute-to-diameter ratio of the Series 301 design. This product is sold individually with a minimum order quantity of 10 units.

Key Features

• Wire size 91 with 0.0083-inch decimal diameter for micro-precision bore work
• Cobalt tool material provides heat resistance and edge retention in abrasive or work-hardening materials
• 118-degree faceted point with web thinning reduces thrust and improves centering
• Spiral flute with tapered web configuration aids chip clearance in short-depth bores
• DIN 1899 compliant Series 301 design ensures dimensional consistency
• Bright/uncoated finish suitable for aluminum, non-ferrous metals, and titanium alloys

Compatibility

Designed as an OEM-style micro drill conforming to DIN 1899 Series 301. Primary workpiece material compatibility is aluminum and non-ferrous metals (material codes K, M, N, P); secondary compatibility includes titanium alloy (material code S). Straight-cylindrical 1.00 mm shank fits standard micro drill chucks and precision collet holders.

Installation Notes

Installation and use should be performed by qualified machinists familiar with micro-diameter tooling. Secure the straight-cylindrical shank fully in a matched collet or micro chuck before operation to prevent runout and bit breakage. Due to the 0.0083-inch diameter, this bit is highly susceptible to breakage from side loading, improper feed rate, or misalignment. Always verify spindle runout and use appropriate low-feed, high-speed drilling parameters for the workpiece material per established machining standards.