Accupro A-6100189R Micro Drill Bit 1.89 Mm Solid Carbide

Product Description

The ACCUPRO A-6100189R is a solid carbide micro drill bit designed for precision drilling in miniature and tight-tolerance applications. With a 1.89 mm (0.0744 inch) drill diameter and a 120-degree point angle, this bit delivers accurate hole placement and clean entry in hard and abrasive materials. The straight-cylindrical shank measures 2.00 mm in diameter, and the overall length is 38.00 mm with a 12.00 mm flute length. The bright/uncoated finish suits applications where coating interaction with the workpiece material is a concern. This bit is installed by machinists, tool-and-die makers, and precision fabricators working with CNC machines, drill presses, or manual micro-drilling setups.

The A-6100189R belongs to the Miniature Series and is suited for applications requiring small-diameter, high-precision holes. Typical use cases include circuit board drilling, watchmaking, instrument manufacturing, medical device fabrication, and other work where hole diameter tolerances are tight and bit deflection must be minimized. The right-hand cutting direction and spiral flute geometry support standard clockwise spindle rotation and efficient chip evacuation in shallow to moderate depth holes.

Key Features

• 1.89 mm (0.0744 inch) drill diameter for micro and miniature hole applications
• 120-degree standard point angle for accurate self-centering entry
• Solid carbide construction for rigidity and wear resistance in hard materials
• Bright/uncoated finish with no added coating buildup affecting hole tolerances
• Straight-cylindrical 2.00 mm shank for compatibility with standard collets and chucks
• Spiral flute geometry promotes chip clearance during drilling

Compatibility

Designed as an OEM-style replacement and standard tooling option for micro-drilling operations using collet chucks or drill holders accepting a 2.00 mm straight-cylindrical shank.

Installation Notes

This bit is intended for use by machinists and precision fabricators operating CNC machining centers, micro drill presses, or benchtop precision drilling equipment. Secure the shank fully in a collet or chuck rated for the 2.00 mm diameter before operation. Ensure spindle runout is within acceptable limits for the hole tolerance required, as micro-diameter carbide bits are brittle and sensitive to lateral loading. Do not use with variable-speed tools that cannot maintain consistent RPM for the material and diameter being drilled.