Accupro A-6120166R Micro Drill Bit 1.66mm Solid Carbide

Product Description

The ACCUPRO A-6120166R is a solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. With a 1.66 mm (0.0654 inch) diameter and a 120-degree drill point angle, this bit delivers clean, accurate entry holes in hard and abrasive materials. The bright/uncoated solid carbide construction provides rigidity and dimensional stability at small diameters where high-speed steel would deflect or wear prematurely. Overall length is 38.00 mm with a 2.00 mm straight-cylindrical shank. The spiral flute geometry promotes chip evacuation in shallow-to-moderate depth holes. Machinists and toolroom technicians working in precision manufacturing, electronics, and instrument fabrication rely on this geometry for repeatable results.

This bit is suited for CNC machining centers, drill presses, and precision hand-piece spindles operating at elevated RPM appropriate for small-diameter carbide tooling. The miniature series designation indicates it is intended for fine-feature work such as PCB drilling, watch and instrument components, medical device parts, and fine metal fabrication. The straight-cylindrical shank seats directly in standard collets and drill chucks sized for 2.00 mm shanks. No coolant-through capability means cutting fluid must be applied externally when machining materials that generate significant heat.

Key Features

• Solid carbide construction for rigidity and wear resistance at micro diameters
• 1.66 mm (0.0654 inch) cutting diameter with a 2.00 mm straight-cylindrical shank
• 120-degree standard point angle for controlled entry and reduced thrust force
• Regular spiral flute with bright/uncoated finish for compatibility with a broad range of materials
• 38.00 mm overall length with 7.20 mm flute length suited to shallow micro-bore work
• Right-hand cutting direction for standard CNC and manual spindle operation

Compatibility

Designed as an OEM-style miniature drill bit for use in any spindle or collet chuck accepting a 2.00 mm straight-cylindrical shank. Consult machine documentation to confirm spindle speed range appropriate for 1.66 mm solid carbide tooling.

Installation Notes

Installation is performed by machinists or toolroom personnel. Power down and lock out the spindle before loading or removing the bit from the collet or drill chuck. Ensure the shank is fully seated and the collet nut is torqued to the machine specification before operation. At micro diameters, runout in the spindle or collet directly impacts tool life and hole quality, so verify setup with a dial indicator when tolerances are critical.