Harvey Tool DHE0937-C3 Micro Drill Bit 3/32 in Carbide

Product Description

The HARVEY TOOL DHE0937-C3 is a solid carbide micro drill bit designed for precision drilling in prehardened mold steels and similarly hard ferrous materials. It carries a 3/32 inch (0.0937 inch) diameter with an h6 diameter tolerance, a 140-degree drill point angle optimized for hard-material entry, and an AlTiN coating that extends tool life under elevated cutting temperatures. The overall length is 50.00 mm with a 4.00 mm shank diameter, making it compatible with standard collet-style toolholding systems. This bit is part of the Miniature High Performance Drills - Prehardened Steels series, intended for machinists and toolmakers working in tight-tolerance mold and die applications.

This drill is suited for machining centers, CNC mills, and precision drill presses where accurate, small-diameter holes are required in prehardened steels. Typical applications include mold cavities, die components, and tooling fixtures where material hardness and hole location tolerance are critical. The right-hand spiral flute geometry supports efficient chip evacuation in these demanding materials. It is most commonly used by tool and die makers and precision machinists operating in job shop or mold-making environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard steels
• AlTiN coating improves heat resistance and extends cutting edge life
• 140-degree drill point angle reduces thrust and improves entry in prehardened materials
• h6 diameter tolerance ensures close fit in precision toolholding
• Right-hand spiral flute promotes consistent chip evacuation
• 4.00 mm shank diameter compatible with standard collet and toolholder systems

Compatibility

Rated for use in prehardened mold steel as both the primary and secondary workpiece material. Designed for use with collet-style toolholders accepting a 4.00 mm shank. Specific machine compatibility depends on spindle speed capability and rigidity appropriate for solid carbide micro tooling.

Installation Notes

Solid carbide micro drill bits should be installed by qualified machinists in a balanced, runout-minimized collet or toolholder. Secure the shank fully within the collet bore before torquing to prevent slippage or bit deflection. Always verify spindle speed and feed rate parameters are appropriate for carbide tooling in hardened steel before initiating a cut. Inspect the cutting edge under magnification before each use, as micro-diameter carbide tools are susceptible to chipping if subjected to interrupted cuts or excessive runout.