Harvey Tool 20260-C3 Micro Drill Bit No. 66 Solid Carbide

Product Description

The HARVEY TOOL 20260-C3 is a solid carbide micro drill bit designed for high-precision drilling in tight-tolerance applications. It carries a wire gauge size of No. 66, which corresponds to a decimal diameter of 0.0330 inches, and features a 130-degree split-point geometry that reduces walking and improves centering on entry. The AlTiN coating increases surface hardness and thermal resistance, extending tool life in harder workpiece materials. With a 1/8-inch shank diameter and an overall length of 1.5000 inches, this bit fits standard collet chucks and drill chucks common in CNC machining centers, micro-drilling fixtures, and precision bench machines.

This drill bit is suited for precision machining operations in aerospace, electronics, medical device, and general metalworking environments where small-diameter holes are required. The spiral flute design promotes chip evacuation in deep-hole applications common in stainless steel, hardened steels, titanium, and similar difficult-to-machine materials. Right-hand cut orientation matches standard spindle rotation on conventional CNC and manual drill presses. Machinists and tool-and-die professionals working with miniature-scale components will find this bit appropriate for production and prototype work alike.

Key Features

• No. 66 wire gauge size at 0.0330 inches decimal diameter for micro-scale hole requirements
• 130-degree drill point angle reduces thrust force and improves self-centering on entry
• Solid carbide construction provides rigidity and wear resistance in hard materials
• AlTiN coating delivers elevated thermal resistance and extended tool life at higher cutting speeds
• Spiral flute geometry promotes efficient chip evacuation during drilling
• Right-hand cut with 1/8-inch shank for compatibility with standard collet and chuck systems

Compatibility

Designed for use in CNC machining centers, micro-drilling stations, and precision drill presses equipped with a 1/8-inch collet or drill chuck. Belongs to the Harvey Tool Miniature Drills series.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician familiar with small-diameter carbide tooling. Secure the shank fully in a collet or chuck before operation, and verify runout is within acceptable tolerance to prevent micro-drill breakage. Carbide is brittle - avoid side loading, interrupted cuts without appropriate feed adjustments, or hand-feeding with excessive pressure. Follow machine manufacturer guidelines for appropriate spindle speeds and feed rates for the workpiece material.