Guhring 9038990005300 Micro Drill Bit No. 75 Solid Carbide

Product Description

The GUHRING 9038990005300 is a solid carbide micro drill bit designed for precision drilling in demanding machining applications. Built to Series 3899 standards, it carries a TiAlN coating that improves heat resistance and extends tool life in abrasive materials. The drill measures 0.0209 inches in diameter (No. 75 wire size) with a 140-degree faceted point and a web-thinned geometry that reduces entry force and improves chip evacuation. Overall length is 38 millimeters with a 3 millimeter straight-cylindrical shank. This tool is installed by machinists and toolroom technicians working on precision components in ferrous materials.

This micro drill bit is suited for small-hole drilling operations in cast iron and steel workpieces where tight tolerances and controlled entry are required. The 5xD flute-to-diameter ratio and spiral flute design support chip clearing in shallow-to-moderate depth holes up to a maximum drilling depth of 6.21 millimeters (0.2440 inches). Right-hand cutting direction makes it compatible with standard machine spindle rotation. Typical applications include CNC machining centers, drill presses, and precision bench equipment used in production and toolroom environments.

Key Features

• Solid carbide construction in Material Grade K40 for rigidity and wear resistance in hard materials
• TiAlN coating improves thermal resistance and tool life in cast iron and steel
• 140-degree faceted point with web-thinning reduces thrust force on entry
• Spiral flute with 5xD ratio supports chip evacuation up to 6.21 mm depth
• Straight-cylindrical shank with h7 diameter tolerance for precise collet or chuck seating
• Right-hand cut compatible with standard CNC and manual machine spindles

Compatibility

Designed for use in precision drilling of cast iron and steel workpieces. Compatible with standard collets or drill chucks accepting a 3 millimeter straight shank. Part of the GUHRING Series 3899 micro drill line.

Installation Notes

Installation and tool changes should be performed with the machine spindle fully stopped and power locked out. Seat the straight-cylindrical shank fully and evenly in the collet or chuck before torquing the clamping device. Micro drill bits at this diameter are brittle — avoid side loading, misalignment, or excessive feed rates that can cause breakage. Consult the machining center or drill press manufacturer guidelines and applicable shop safety standards before operation.