Guhring 9038990018000 Micro Drill Bit 1.8mm Carbide

Product Description

The GUHRING 9038990018000 is a solid carbide micro drill bit designed for precision drilling in demanding industrial applications. Built to Series 3899 specifications, it features a 1.8 mm diameter with an h7 diameter tolerance, a 140-degree faceted point, and a TiAlN coating that improves heat resistance and extends tool life at elevated cutting speeds. The overall length is 38 mm, with a 12 mm flute length and a maximum drilling depth of 9.3 mm. A web-thinned geometry reduces thrust force at entry and helps maintain positional accuracy in small-diameter work. This drill is used by machinists and tooling specialists in production and job-shop environments.

This micro drill bit is suited for drilling cast iron and steel in applications where tight tolerances and small bore diameters are required. The straight-cylindrical shank at 3 mm diameter fits standard collet chucks and toolholders commonly found on CNC machining centers, drill presses, and precision bench machines. The 5xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes without coolant-through capability, making it appropriate for short, precise bore operations in ferrous materials.

Key Features

• 1.8 mm diameter with h7 tolerance for tight bore accuracy
• Solid carbide K40 grade construction for rigidity in micro-diameter applications
• TiAlN coating for improved thermal resistance and extended tool life
• 140-degree faceted point with web-thinned geometry reduces entry thrust
• Right-hand spiral flute promotes efficient chip evacuation in ferrous materials
• Straight-cylindrical 3 mm shank fits standard collet and drill chuck toolholders

Compatibility

Designed for use in cast iron and steel workpieces. Primary workpiece material codes K and P per ISO classification. Fits standard 3 mm collet chucks and toolholders on CNC and manual machining equipment.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and machine power isolated. Ensure the collet or chuck is clean and the shank is fully seated before clamping to rated torque per toolholder manufacturer specifications. Micro-diameter carbide tools are brittle — avoid side loads, interrupted cuts beyond the tool's rated capacity, and re-chucking in worn or contaminated holders. Verify spindle runout is within acceptable limits before drilling to prevent premature breakage.