Accupro A-6120040R Micro Drill Bit 0.0157 in Solid Carbide

Product Description

The ACCUPRO A-6120040R is a solid carbide micro drill bit designed for high-precision drilling in tight-tolerance applications. With a 0.0157-inch (0.4 mm) diameter and a 120-degree drill point angle, this bit is built for clean, accurate entry in hard and abrasive materials where standard steel bits fail. The bright, uncoated finish maintains dimensional accuracy without the added thickness of a coating layer. At 25.00 mm overall length with a 2.00 mm flute length and a 1.00 mm straight-cylindrical shank, this is a purpose-built miniature tool for precision machining work. It is installed and operated by machinists and toolroom technicians on CNC drill presses, micro-machining centers, and precision manual drilling equipment.

This micro drill bit is suited for applications requiring extremely small-diameter holes in materials such as hardened metals, composites, ceramics, and circuit board substrates. The solid carbide construction provides the rigidity needed at this diameter to resist deflection and breakage during drilling. The miniature series designation makes it appropriate for watchmaking, medical device manufacturing, electronics assembly, and similar high-precision trades where hole size tolerance is critical. Right-hand cutting direction is standard for conventional drill press and CNC spindle rotation.

Key Features

• Solid carbide construction for rigidity and wear resistance at micro diameters
• 0.0157-inch diameter with 120-degree standard point angle for clean entry
• Bright, uncoated finish preserves true diameter and works across a broad material range
• Spiral flute type with regular spiral for consistent chip evacuation
• Straight-cylindrical shank at 1.00 mm for secure chuck retention
• Right-hand cutting direction compatible with standard CNC and drill press spindles
• No coolant-through requirement simplifies setup on standard equipment

Compatibility

Designed as an OEM-style replacement and standard-fit micro drill bit for precision drilling equipment accepting a 1.00 mm straight-cylindrical shank in the miniature drill series.

Installation Notes

This bit is installed by machinists and precision tooling technicians. Secure the straight-cylindrical shank fully in a collet or micro-chuck rated for the shank diameter before operation. Power down and lock out the spindle before changing or inspecting the bit. At this diameter, use appropriate low-feed, high-RPM parameters consistent with the workpiece material — consult the machine manufacturer or tooling application data for feed and speed guidance. Handle with care: solid carbide micro bits are brittle and will fracture under side load or impact.