Accupro A-6120099R Micro Drill Bit Size 61 Solid Carbide

Product Description

The ACCUPRO A-6120099R is a wire gauge size 61 micro drill bit ground from solid carbide and finished bright/uncoated. At 0.0390 inches in diameter, it is engineered for small-hole drilling in tight-tolerance applications where a high-speed steel bit would deflect or wear too quickly. The 120-degree standard point self-centers on entry and reduces thrust force in hard or brittle materials. With an overall length of 30 mm and a spiral flute, the bit evacuates chips efficiently even in deep micro-bores. Right-hand cutting direction and a straight-cylindrical shank make it compatible with standard collet and drill chuck setups used in precision machining environments.

This bit is suited for machinists, toolmakers, and precision fabricators working in electronics manufacturing, instrumentation, mold and die work, and similar applications requiring repeatable small-diameter holes. The miniature series designation indicates it is intended for light-duty drilling operations in materials such as hardened steel, stainless, aluminum, plastics, and circuit board substrates. The 1.50 mm shank diameter is consistent with micro-drill collet sizes common on CNC machining centers, drill presses, and precision hand-piece tools used in bench and production settings.

Key Features

• Solid carbide construction provides rigidity and wear resistance in hard and abrasive materials
• Wire gauge size 61 — 0.0390 inch diameter for tight-tolerance micro-hole applications
• 120-degree standard point angle reduces thrust and promotes self-centering on entry
• Bright/uncoated finish maintains accurate diameter tolerances without coating buildup
• Spiral flute with regular helix promotes chip evacuation in deep micro-bores
• 30 mm overall length with 4.80 mm flute length suited for shallow precision drilling
• Right-hand cut with straight-cylindrical 1.50 mm shank fits standard micro collets and chucks

Compatibility

Designed for use in standard collet chucks and drill chuck setups that accept a 1.50 mm straight-cylindrical shank, typical of CNC machining centers, benchtop drill presses, and precision rotary hand-piece tools used in micro-drilling applications.

Installation Notes

Micro drill bits of this diameter should be seated fully and securely in a properly sized collet or chuck before operation to prevent runout and bit breakage. Ensure spindle speed is appropriate for the bit diameter and workpiece material — micro carbide bits are brittle and will snap under side load or excessive feed pressure. Power down and de-energize all equipment before changing tooling. Follow applicable machine shop safety practices and manufacturer spindle speed guidelines for carbide micro-drill applications.