Guhring 9003010012900 Cobalt Micro Drill Bit 1.29 Mm

Product Description

The GUHRING 9003010012900 is a cobalt micro drill bit designed for precision drilling in small-diameter applications. Built to DIN 1899 specification, this Series 301 bit features a 1.29 mm cutting diameter, a 118-degree faceted point angle, and a web-thinned, tapered web configuration that reduces entry force and improves chip evacuation. The bright/uncoated cobalt construction provides heat resistance without a surface coating, making it well suited for high-speed drilling in tough materials. Right-hand spiral fluting promotes consistent chip clearance throughout the cut. Licensed machinists, tool-and-die technicians, and precision fabricators are the primary users of this bit.

This micro drill bit is rated for use in aluminum as its primary workpiece material, with titanium alloy as a secondary workpiece material. Its 1.29 mm diameter, 25 mm overall length, and 8.50 mm flute length make it appropriate for shallow, tight-tolerance bores in precision machined components, aerospace hardware, and fine metalwork. The maximum drilling depth is 6.57 mm, keeping the application within the short-flute geometry of this Series 301 design. It ships individually but carries a minimum order quantity of 10 units per order.

Key Features

• 1.29 mm cutting diameter with a tight tolerance of +0.000 to -0.004 mm for precision fitment
• 118-degree faceted point angle with web-thinned, tapered web for reduced thrust force
• Cobalt construction, bright/uncoated finish — no coating delamination risk in high-heat applications
• Right-hand spiral flute with regular spiral type for consistent chip evacuation
• Straight-cylindrical shank, 1.50 mm shank diameter, compatible with standard collet chucks and drill presses
• Built to DIN 1899 specification, Series 301

Compatibility

Designed for use in precision drilling of aluminum (material code K, M, N, P) and titanium alloy (material code S). Compatible with standard collet systems and drill chucks accepting a 1.50 mm straight-cylindrical shank.

Installation Notes

Install in a collet or precision drill chuck rated for the 1.50 mm shank diameter and verify runout before drilling. Micro drill bits are sensitive to side loading — use a rigid setup and avoid lateral pressure during entry and retraction. Ensure the workpiece is firmly secured and the spindle speed is appropriate for the workpiece material and bit diameter per the manufacturer feed-and-speed recommendations. Inspect the cutting edge before each use, as cobalt micro bits can chip if mishandled during storage or setup.