Harvey Tool 20220 Micro Drill Bit Wire Size 72 Solid Carbide

Product Description

The HARVEY TOOL 20220 is a solid carbide micro drill bit designed for precision drilling in small-diameter applications. It carries a wire gauge size of 72, which equals 0.0250 inches in decimal. The 130-degree split point reduces walking and improves entry accuracy in tight tolerances. The bright, uncoated finish maintains the full carbide hardness without adding coating thickness that could affect hole diameter in micro-scale work. Right-hand spiral flutes clear chips efficiently during through-hole and blind-hole operations. The 1/8-inch shank diameter allows the bit to seat in standard collet chucks and Jacobs-style drill chucks used across CNC machining centers, drill presses, and manual mills.

This bit is suited for machinists, toolmakers, and precision fabricators working in ferrous and non-ferrous metals, PCB substrates, plastics, and composite materials where small-diameter hole accuracy is critical. At 1.5 inches overall length with a 0.275-inch flute length, the 20220 is optimized for shallow, precise entries rather than deep-hole applications. Typical use cases include prototype machining, fixture building, printed circuit board drilling, and detail work in medical device or aerospace component fabrication.

Key Features

• Solid carbide construction for rigidity and wear resistance in micro-diameter drilling
• Wire size 72 (0.0250 inches) for precision small-diameter hole requirements
• 130-degree point angle reduces drill walk and improves entry location accuracy
• Right-hand spiral flute design promotes consistent chip evacuation
• Bright uncoated finish maintains true diameter tolerance without coating buildup
• 1/8-inch shank fits standard collets and drill chucks

Compatibility

Designed for use in CNC machining centers, drill presses, and manual milling machines equipped with a 1/8-inch collet or Jacobs-style chuck capable of holding a 1/8-inch shank drill bit.

Installation Notes

Installation and use should be performed by a qualified machinist familiar with small-diameter carbide tooling. Power down and lock out the spindle before seating or removing the bit from the collet or chuck. Carbide is brittle at this diameter — avoid side loading, interrupted cuts, or hand-feeding with excessive pressure, as these can cause the bit to snap. Use appropriate spindle speeds and feed rates for the work material and diameter; refer to the tooling manufacturer speed-and-feed guidelines for 0.0250-inch carbide drills.