Accupro A-6100084R Micro Drill Bit Size 66 Solid Carbide

Product Description

The ACCUPRO A-6100084R is a size 66 wire gauge micro drill bit ground from solid carbide for precision small-hole drilling in demanding applications. The bit features a 120-degree standard point angle and a right-hand spiral flute that efficiently evacuates chips from the cut zone. Overall length is 30 millimeters, with a flute length of 6.30 millimeters and a straight-cylindrical shank diameter of 1.50 millimeters. The bright, uncoated finish leaves the carbide substrate exposed for direct visual inspection of edge condition. This bit is sold individually and is part of the Miniature series, designed for machinists, toolroom technicians, and precision fabricators working in close-tolerance environments.

The A-6100084R is suited for drilling small-diameter holes in printed circuit boards, watch and instrument components, medical device parts, and other applications where a 0.0331-inch nominal diameter is required. The regular spiral geometry and 120-degree point make this bit appropriate for a range of materials including aluminum, brass, plastics, and mild steels. It is intended for use in CNC machining centers, CNC drill presses, and manual precision drill presses equipped with high-speed spindles capable of handling micro tooling safely.

Key Features

• Wire gauge size 66 — 0.0331-inch decimal diameter for close-tolerance micro drilling
• Solid carbide construction provides rigidity and wear resistance compared to HSS alternatives
• 120-degree standard point angle for accurate hole entry and reduced walking
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Straight-cylindrical shank at 1.50 millimeters fits standard micro collets and chucks
• Bright, uncoated finish — no coating variables to account for in feed and speed calculations

Compatibility

Designed as an OEM-style micro drill bit for use in precision drilling operations requiring a wire gauge size 66 tool. Fits standard straight-bore collets and drill chucks sized for a 1.50-millimeter shank diameter.

Installation Notes

Micro drill bits at this diameter are fragile and require a rigid, high-speed spindle with minimal runout to avoid premature breakage. Secure the shank fully in a matched collet or precision chuck before beginning the cut. Feed rates and spindle speeds should be established using manufacturer tooling data for the specific workpiece material. Inspect the cutting edge under magnification before each use, as carbide micro tools can chip without visible signs at normal inspection distance.