Harvey Tool 20235 Micro Drill Bit Wire 69 Solid Carbide

Product Description

The HARVEY TOOL 20235 is a solid carbide micro drill bit designed for high-precision drilling in miniature and tight-tolerance applications. It carries a wire gauge size of 69, which corresponds to a decimal diameter of 0.0292 inches, and features a 130-degree point angle that promotes accurate entry and reduces thrust force on small-diameter work. The bright, uncoated finish keeps the carbide substrate exposed, which suits applications where coating adhesion or contamination is a concern. With an overall length of 1.5 inches and a 1/8-inch shank diameter, this drill fits standard miniature drill chucks and collet systems used by machinists, toolmakers, and precision fabricators.

This drill bit is built for miniature drilling work in industries that require repeatable accuracy at very small diameters. Typical applications include printed circuit board fabrication, instrument manufacturing, mold and die work, and precision machining of small metal and composite components. The right-hand spiral flute geometry assists chip evacuation during through-hole and blind-hole operations. It is suited for use in CNC machining centers, drill presses, and rotary hand tools with appropriate collet systems. A flute length of 0.335 inches provides adequate depth capacity for the majority of micro drilling tasks in this size range.

Key Features

• Wire size 69 with a decimal diameter of 0.0292 inches for tight-tolerance micro drilling
• 130-degree point angle reduces thrust and improves hole entry accuracy
• Solid carbide construction delivers hardness and rigidity at small diameters
• Spiral flute design promotes chip evacuation from the cut zone
• Bright, uncoated finish preserves edge sharpness without coating buildup
• 1/8-inch shank diameter is compatible with standard miniature drill chucks and collet holders

Compatibility

Designed as an OEM-style replacement or direct-use miniature drill bit for use in CNC machining centers, benchtop drill presses, and rotary tools equipped with collet or chuck systems accepting a 1/8-inch shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or toolmakers familiar with small-diameter tooling. Ensure the machine spindle and collet or chuck are powered down and fully stopped before loading or removing the bit. Solid carbide micro drills are brittle at this diameter — avoid side loads, manual deflection, or impact that can cause breakage. Follow equipment manufacturer guidelines for spindle speed, feed rate, and coolant use when working at sub-0.030-inch diameters.