Accupro A-6120255R Micro Drill Bit 2.55 Mm Solid Carbide

Product Description

The ACCUPRO A-6120255R is a solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. It measures 2.55 mm in diameter with a 120-degree point angle and a 38 mm overall length, placing it firmly in the miniature drill category. The bright, uncoated finish maintains dimensional accuracy at the cutting edge. Right-hand spiral fluting promotes consistent chip evacuation during through-hole and blind-hole operations. Licensed machinists, toolroom technicians, and precision fabricators rely on carbide micro drills like this one when working with hard or abrasive materials that would rapidly wear high-speed steel tooling.

This drill bit is suited for use in CNC machining centers, drill presses, and precision hand-held spindles where small-diameter hole accuracy is critical. Typical applications include circuit board drilling, watch and instrument component manufacturing, medical device fabrication, and aerospace detail work. The straight-cylindrical shank allows direct chuck mounting in standard collet or keyless drill chucks compatible with 3 mm shank diameters. The regular spiral geometry provides a balanced combination of rigidity and cutting efficiency at small diameters.

Key Features

• 2.55 mm cutting diameter (0.1004 decimal inch) for precision micro-hole work
• Solid carbide construction for superior hardness and wear resistance versus HSS alternatives
• 120-degree standard point angle for accurate centering and reduced thrust force
• 38 mm overall length with 14 mm flute length for controlled chip evacuation
• Right-hand cut with regular spiral flute for consistent feed and clearance
• Bright, uncoated finish maintains close tolerances at the cutting edge

Compatibility

Designed for use in machining applications requiring a 3 mm straight-cylindrical shank micro drill bit with a 2.55 mm cutting diameter, compatible with standard collet chucks and keyless chucks sized for 3 mm shanks.

Installation Notes

Micro drill bits at this diameter are fragile and require rigid machine setups with minimal runout to avoid breakage. Secure the shank fully in a clean, properly sized collet or chuck before operation, and confirm spindle runout is within acceptable tolerance for the diameter. Reduce feed rates and use pecking cycles to clear chips in deep-hole applications. Do not exceed the recommended speed and feed range for the material being drilled, as solid carbide micro drills are sensitive to lateral loading and vibration.