Accupro A-6120121R Micro Drill Bit 1.21 Mm Solid Carbide

Product Description

The ACCUPRO A-6120121R is a miniature solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. It features a 1.21 mm (0.0476 inch) cutting diameter, a 120-degree standard point angle, and a spiral flute geometry with right-hand cut direction. The bright, uncoated finish is suitable for applications where coating would alter dimensional tolerances. At 30 mm overall length with a 1.50 mm straight-cylindrical shank, this bit is sized for use in small spindles and precision drilling fixtures common in tool-and-die, electronics fabrication, and fine metalworking operations.

This micro drill bit is intended for professional machinists, toolmakers, and precision fabricators working with small-diameter hole requirements. The miniature series designation makes it appropriate for circuit board drilling, instrument components, watch parts, mold work, and other applications demanding controlled hole geometry at sub-2 mm diameters. Solid carbide construction provides the rigidity needed at this scale, where high-speed steel flex would compromise hole straightness and surface finish.

Key Features

• 1.21 mm cutting diameter (0.0476 inch decimal equivalent) for precision micro-bore work
• 120-degree standard point angle for accurate entry and reduced walking
• Solid carbide construction delivers rigidity and wear resistance at miniature scale
• Spiral flute with regular spiral type promotes chip evacuation in small holes
• Bright/uncoated finish maintains dimensional integrity in tolerance-critical applications
• 1.50 mm straight-cylindrical shank fits standard small-spindle collets and chucks

Compatibility

Designed for use in CNC machining centers, drill presses, and precision hand-held spindles accepting a 1.50 mm straight-cylindrical shank. Suitable for drilling ferrous and non-ferrous metals, plastics, and composite materials at miniature diameters.

Installation Notes

Installation and use should be performed by qualified machinists familiar with micro-drilling practices. Ensure the spindle collet or chuck is clean and properly sized for the 1.50 mm shank before seating the bit to prevent runout. Power down and lock out the machine before changing tooling. At sub-2 mm diameters, feed rate and spindle speed selection are critical — consult the machine manufacturer and carbide tooling guidelines to avoid bit fracture.