Guhring 9038990005700 Micro Drill Bit 74 Wire 140pt Carbide

Product Description

The GUHRING 9038990005700 is a solid carbide micro drill bit designed for precision drilling in demanding industrial and machining applications. Built to Series 3899 specifications, it features a 140-degree faceted point angle and a TiAlN coating that extends tool life when cutting through abrasive or hard materials. The drill has an overall length of 38 millimeters and a straight-cylindrical shank with a 3 millimeter shank diameter held to an h7 tolerance. Its spiral flute geometry and web-thinned construction reduce thrust force and improve chip evacuation in small-diameter drilling operations. This tool is installed by machinists, tool-and-die technicians, and precision fabrication professionals.

This micro drill bit is suited for drilling in cast iron and steel workpieces in both production and maintenance machining environments. The wire size 74 designation corresponds to a decimal diameter of 0.0224 inches, placing it in the micro-diameter category where dimensional accuracy and concentricity are critical. The 5xD flute-to-diameter ratio supports drilling depths up to 6.15 millimeters (0.242 inches), making it appropriate for through-holes and shallow blind holes in tight-tolerance parts. No coolant-through capability is present, so external coolant or cutting fluid application is standard practice for this tool.

Key Features

• Solid carbide construction in material grade K40 for rigidity and wear resistance at micro diameters
• TiAlN coating improves heat resistance and extends tool life in ferrous materials
• 140-degree faceted point angle reduces walking and improves entry accuracy
• Web-thinned design lowers axial thrust and helps chip clearance in small-diameter holes
• Straight-cylindrical shank with h7 tolerance for consistent runout in standard collet chucks
• Right-hand cut with regular spiral flute compatible with conventional CNC and manual drill press setups

Compatibility

Designed as an OEM-style precision micro drill for use in CNC machining centers, drill presses, and precision hand tools that accept a 3 millimeter straight-cylindrical shank. Primary workpiece materials are cast iron and steel.

Installation Notes

This tool should be installed by qualified machinists or tooling technicians familiar with micro-diameter drill handling. Ensure the spindle and collet chuck are clean and true before seating the shank to minimize runout at this diameter. Power down or lock out the machine before changing tooling per standard shop safety practice. Avoid side-loading or using excessive feed rates, as solid carbide micro drills are brittle and will fracture under lateral stress.