Accupro A-6120039R Micro Drill Bit 0.39 Mm Solid Carbide

Product Description

The ACCUPRO A-6120039R is a solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. With a 0.39 mm (0.0154 inch) diameter and a 120-degree point angle, this bit delivers accurate, repeatable entry in small-diameter hole work. The bright, uncoated finish keeps the cutting geometry clean and predictable. At 25 mm overall length with a 2 mm flute length and a 1.00 mm straight-cylindrical shank, the A-6120039R fits standard miniature drill chucks used in precision machining environments. The spiral, regular-helix flute design promotes chip evacuation from shallow micro holes. This bit is intended for machinists and toolmakers working with precision drilling equipment.

The A-6120039R is suited for precision micro-drilling operations in metalworking, electronics manufacturing, and instrument fabrication. The straight-cylindrical shank allows seating in collet chucks and precision drill chucks commonly found on CNC drilling centers, drill presses, and micro-machining stations. The 120-degree standard point angle is appropriate for general-purpose micro-hole work in a variety of workpiece materials. Right-hand cutting direction is standard for conventional drill-press and CNC spindle rotation.

Key Features

• 0.39 mm (0.0154 inch) diameter for tight-tolerance micro-drilling
• Solid carbide construction provides rigidity and wear resistance at small diameters
• 120-degree standard point angle for accurate hole entry
• Spiral regular-helix flute promotes chip evacuation in shallow micro holes
• 1.00 mm straight-cylindrical shank fits standard miniature collet and drill chucks
• Bright, uncoated finish — no coating buildup at the cutting edge

Compatibility

Designed as an OEM-style miniature drill bit for use in precision collet chucks and drill chucks accepting a 1.00 mm straight-cylindrical shank, typical of CNC drilling centers and micro-machining stations.

Installation Notes

Installation should be performed by a qualified machinist or toolmaker familiar with micro-drill handling. Secure the shank fully in the collet or chuck before operation and verify runout with a dial indicator when tolerances are critical. Micro drills are brittle at this diameter — avoid side loading and use appropriate feed rates for the workpiece material. Never apply force to seat the bit; seating should be achieved by proper collet or chuck tightening only.