Guhring 9003010001250 Micro Drill Bit Cobalt 118 Point

Product Description

The GUHRING 9003010001250 is a cobalt micro drill bit engineered for precision drilling in small-diameter applications. Built to Series 301 standards, this bit measures 0.0049 inches (0.12 mm) in diameter with a 118-degree faceted point and a web-thinned tip geometry that reduces thrust and improves centering at entry. The overall length is 25 mm, and the straight-cylindrical shank measures 1.00 mm in diameter, making it compatible with standard micro chucks and collet systems. The bright, uncoated cobalt construction provides good heat resistance and edge retention when cutting non-ferrous and light alloy materials. Right-hand spiral flutes evacuate chips efficiently through the 0.80 mm flute length.

This micro drill bit is suited for precision drilling operations in aluminum, titanium alloy, and similar workpiece materials where tight tolerances and small hole diameters are required. Typical applications include printed circuit board work, instrument components, mold and die detail work, and fine metalwork in both production and repair environments. The h8 diameter tolerance ensures consistent fit and runout performance in close-tolerance setups. It is installed and used by machinists, tool-and-die makers, and precision fabricators working on CNC or manual spindle equipment.

Key Features

• 0.0049 inch (0.12 mm) diameter with h8 tolerance for consistent, repeatable hole sizing
• 118-degree faceted point with web thinning reduces entry thrust and improves self-centering
• Cobalt tool material provides heat resistance and edge retention in hard and abrasive workpieces
• Right-hand spiral flute with 5xD flute-to-diameter ratio for efficient chip evacuation at micro scale
• Bright uncoated finish suitable for aluminum (K, M, N, P material codes) and titanium alloy (S material code)
• Straight-cylindrical shank at 1.00 mm diameter fits standard micro collets and chucks

Compatibility

Designed as an OEM-style precision micro drill for use with standard straight-bore micro collets, pin vises, and CNC spindle toolholders accepting a 1.00 mm straight-cylindrical shank. Primary workpiece materials are aluminum and aluminum alloys (ISO material codes K, M, N, P); secondary workpiece material is titanium alloy (ISO material code S).

Installation Notes

Micro drill bits at this diameter are extremely fragile and must be installed in a precision collet or micro chuck that is clean and free of runout. Secure the shank fully within the collet bore before applying any spindle load. Always verify spindle speed and feed rate against published guidelines for cobalt micro drills at this diameter before cutting. Handle with care during installation and storage to avoid tip damage or shank bending.