Accupro A-6120077R Micro Drill Bit 0.77 Mm Solid Carbide

Product Description

The ACCUPRO A-6120077R is a solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. With a 0.77 mm diameter (0.0303 inches) and a 120-degree point angle, this bit delivers accurate hole entry and clean penetration in hard and abrasive materials. The bright uncoated finish suits applications where coating interaction with the workpiece is a concern. At 30 mm overall length with a 4.20 mm flute length, this miniature-series bit is built for controlled, short-run drilling where runout and deflection must be minimized. Installation and use typically fall to machinists, toolmakers, and precision fabricators working on small-component production.

This micro drill bit is suited for precision machining operations requiring very small hole diameters, including work on circuit boards, instrument components, watch parts, medical device components, and other miniature assemblies. The straight-cylindrical shank with a 1.50 mm shank diameter seats securely in collet chucks and precision drill chucks. The right-hand spiral flute geometry evacuates chips efficiently during through-hole and blind-hole drilling in metals, plastics, and composite materials where tight diameter tolerances are required.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard and abrasive materials
• 0.77 mm diameter with 120-degree standard point angle for accurate hole entry
• Bright uncoated finish compatible with a wide range of workpiece materials
• Spiral flute, right-hand cut geometry promotes clean chip evacuation
• Straight-cylindrical shank at 1.50 mm diameter for secure collet chuck retention
• 30 mm overall length with 4.20 mm flute length for controlled depth drilling in miniature applications

Compatibility

Designed as an OEM-style miniature-series micro drill bit suitable for use in precision collet chucks and drill chucks that accept a 1.50 mm straight-cylindrical shank.

Installation Notes

Installation is performed by machinists and precision tooling technicians using CNC machining centers, drill presses, or precision hand-held rotary tools equipped with appropriate collet sizes. Ensure the machine spindle is fully stopped and locked before changing or seating the bit. At sub-millimeter diameters, excessive feed rate or lateral force will cause bit breakage — follow the machine manufacturer and tooling guidelines for feed and speed at this diameter range. Secure the workpiece firmly before drilling to prevent deflection that can damage the bit or compromise hole accuracy.