Guhring 9038990018500 Micro Drill Bit 1.85mm Carbide

Product Description

The GUHRING 9038990018500 is a solid carbide micro drill bit designed for precision drilling in ferrous workpiece materials including cast iron and steel. Built to Series 3899 specifications, it features a 140-degree faceted point angle for accurate entry without walking, a TiAlN coating for heat resistance and extended tool life, and a web-thinned geometry that reduces thrust force during penetration. The straight-cylindrical shank measures 3.00 mm in diameter, fitting standard collet and chuck setups. Overall length is 38.00 mm with a 12.00 mm flute length, yielding a flute-to-diameter ratio of 5xD. This drill is used by machinists and tool-and-die professionals working in close-tolerance applications where hole quality and dimensional accuracy are critical.

This drill bit is suited for small-hole drilling operations in cast iron and steel components across production machining, toolroom, and maintenance environments. The No. 49 wire gauge size (1.85 mm, 0.0728 decimal inch) makes it appropriate for pilot holes, through-holes, and tapping preparation in thin-walled or compact workpieces where micro-diameter tooling is required. Maximum recommended drilling depth is 9.23 mm (0.363 decimal inch). The spiral flute configuration promotes chip evacuation in both interrupted and continuous cuts.

Key Features

• Solid carbide construction, Material Grade K40, for rigidity and wear resistance in hard ferrous materials
• TiAlN coating increases surface hardness and thermal resistance at the cutting edge
• 140-degree faceted point angle provides self-centering entry and reduces drill walk
• Web-thinned geometry lowers axial thrust, reducing spindle load in micro-diameter applications
• Straight-cylindrical shank with h7 diameter tolerance for consistent collet seating and runout control
• Regular spiral flute with 5xD flute-by-diameter ratio supports chip clearance at depth

Compatibility

Designed for use in cast iron and steel workpieces. Compatible with standard collets and drill chucks accepting a 3.00 mm straight-cylindrical shank. Sized to No. 49 wire gauge for applications requiring a 1.85 mm hole diameter.

Installation Notes

Installation and use of this tooling should be performed by qualified machinists familiar with CNC or manual machine operation. Secure the shank fully within the collet or chuck to the manufacturer-recommended engagement depth before starting the spindle. Verify spindle runout is within acceptable limits for micro-diameter tooling before drilling, as excessive runout accelerates breakage at this diameter. Coolant through is not supported on this drill; apply external coolant or cutting fluid as appropriate for the workpiece material and machine setup.