Guhring 9003010002500 Micro Drill Bit Wire 87 Cobalt

Product Description

The GUHRING 9003010002500 is a cobalt micro drill bit in Series 301, designed for precision drilling in tight-tolerance applications. It carries a wire gauge size of 87, corresponding to a decimal diameter of 0.0098 inches, and features a 118-degree faceted point angle with web thinning on a tapered web configuration. The overall length is 0.984 inches. Right-hand spiral flute geometry promotes chip evacuation in small-diameter bores. The bright, uncoated finish keeps the tool close to its nominal dimension, critical when drilling holes measured in thousandths of an inch. Licensed machinists, tool-and-die makers, and precision fabricators typically deploy this bit.

This micro drill bit is suited for drilling aluminum as its primary workpiece material, with titanium alloy listed as a secondary workpiece material. The straight-cylindrical shank with a 1.00 mm shank diameter seats securely in standard precision collet chucks or micro drill presses. The 5xD flute-by-diameter ratio supports controlled drilling depths up to 0.060 inches. Applications include watch and instrument components, printed circuit board piloting, and fine metalwork in aerospace and precision manufacturing environments where DIN 1899 geometry is specified.

Key Features

• Wire size 87 decimal diameter of 0.0098 inches for precision micro-bore work
• 118-degree faceted point with web thinning for accurate hole entry and reduced thrust
• Cobalt tool material provides heat resistance for difficult alloys including titanium
• Bright uncoated finish maintains tight diameter tolerance of +0.000 to -0.004 mm
• Regular spiral flute type with right-hand cut for controlled chip removal
• Conforms to DIN 1899 specification for standardized micro drill geometry

Compatibility

Rated for primary use in aluminum workpieces and secondary use in titanium alloys. Designed as a DIN 1899 Series 301 micro drill for use in precision collet chucks and micro drill presses accepting a 1.00 mm straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists familiar with micro-diameter tooling. Secure the shank in a precision collet to minimize runout, which at this diameter can cause immediate tool breakage. Confirm spindle speed and feed rate match the workpiece material before drilling. At 0.0098 inches diameter, this bit is highly fragile — avoid side loading, interrupted cuts, or applying any force to clear chips manually while the spindle is running.