Guhring 9038990017500 Micro Drill Bit 1.75mm Carbide

Product Description

The GUHRING 9038990017500 is a solid carbide micro drill bit designed for precision drilling in demanding metalworking applications. Built to Series 3899 specifications, it features a 1.75 mm diameter, a 140-degree faceted point, and a TiAlN coating that extends tool life by reducing heat buildup and wear at the cutting edge. The straight-cylindrical shank measures 3.00 mm in diameter, and the overall length is 38.00 mm. Web thinning reduces thrust force at entry, which is especially important at this small diameter. This drill is suited for machinists, toolroom technicians, and production shop operators working in high-precision environments.

This micro drill bit is intended for use in cast iron and steel workpieces, covering material codes K and P. The 12.00 mm flute length supports a maximum drilling depth of 9.38 mm, and the 5xD flute-to-diameter ratio provides chip clearance in deeper bores. It is well suited for CNC machining centers, drill presses, and precision manual spindles where tight tolerances and small-diameter hole accuracy are required. The h7 diameter tolerance ensures consistent fit and repeatable results across production runs.

Key Features

• Solid carbide construction with M-grade K40 material for rigidity and wear resistance in hard materials
• TiAlN coating reduces friction and extends tool life in ferrous machining
• 140-degree faceted point angle minimizes walking and improves entry accuracy at small diameters
• Web-thinned geometry reduces axial thrust force during penetration
• h7 shank diameter tolerance ensures reliable chuck grip and runout control
• Right-hand spiral flute promotes efficient chip evacuation in through and blind holes

Compatibility

Designed for drilling cast iron and steel workpieces (material codes K and P). Fits standard 3.00 mm straight-cylindrical collets and drill chucks on CNC machining centers and precision drill presses.

Installation Notes

Installation and tool changes must be performed with the spindle fully stopped and locked out per shop lockout/tagout procedures. Ensure the collet or chuck bore is clean and free of chips before seating the shank. At micro diameters, runout greater than a few microns can cause premature breakage — verify spindle and collet runout before drilling. Follow the tooling manufacturer's recommended speeds and feeds for the specific workpiece material and depth of cut.