Harvey Tool CHT0625-C3 Micro Drill Bit 1/16 in Carbide

Product Description

The HARVEY TOOL CHT0625-C3 is a solid carbide micro drill bit designed for precision drilling in pre-hardened mold steels and similarly tough ferrous materials. Measuring 1/16 inch (0.0625 inches) in diameter, it features a 140-degree point angle that reduces thrust and improves centering on hard workpiece surfaces. The AlTiN coating provides thermal resistance and extended tool life under high-speed cutting conditions. With an overall length of 63 mm and a spiral flute design, this bit is engineered for the tight tolerances and demanding cycle counts common in mold making and toolroom environments. Installation and use require a compatible toolholder accepting a 3 mm shank diameter.

This drill bit is suited for machining pre-hardened mold steel in both mold making and die shops, as well as general toolroom applications where small-diameter, high-precision holes are required. It belongs to the Miniature High Performance Drills series optimized for prehardened steels. Typical applications include blind and through holes in hardened workpieces where dimensional accuracy and hole quality are critical. The right-hand cutting direction and spiral flute geometry support efficient chip evacuation in deep or interrupted cuts on CNC machining centers and drill presses.

Key Features

• Solid carbide construction for rigidity and wear resistance in hardened materials
• AlTiN coating for thermal protection and extended tool life at elevated cutting speeds
• 140-degree point angle reduces thrust and improves self-centering on hard surfaces
• Spiral flute geometry promotes chip evacuation in deep-hole applications
• h6 diameter tolerance ensures consistent fit in precision toolholders
• 3 mm shank diameter compatible with standard miniature toolholding systems

Compatibility

Designed for use with pre-hardened mold steel as the primary and secondary workpiece material. Accepts toolholders sized for a 3 mm shank. Belongs to the Miniature High Performance Drills - Prehardened Steels series.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the tool is secured in a clean, properly sized collet or toolholder before operation. Verify runout with a dial indicator before beginning a cut, as excessive runout accelerates wear and breakage at this diameter. Follow the machine manufacturer and cutting tool manufacturer guidelines for speeds, feeds, and coolant when machining hardened steels.