Accupro A-6100104R Micro Drill Bit Size 59 1.04mm Carbide

Product Description

The ACCUPRO A-6100104R is a miniature series solid carbide micro drill bit designed for precision drilling in tight-tolerance applications. Ground to a 120-degree point angle with a right-hand spiral flute, it cuts cleanly through ferrous and non-ferrous materials at small diameters where standard tooling cannot reach. The wire gauge size 59 corresponds to 1.04 mm (0.0409 inches) diameter. The bright, uncoated finish suits applications where coating buildup at this scale would affect hole size accuracy. Machinists, toolroom technicians, and precision fabricators use this bit in CNC drilling centers, drill presses, and high-speed spindle fixtures.

This micro drill bit is suited for precision machining operations requiring small-diameter through-holes or blind holes in metal, printed circuit board substrates, plastics, and composite materials. The 30 mm overall length and 1.50 mm straight-cylindrical shank allow it to seat in standard collets and chuck systems used in miniature drilling setups. Its regular spiral flute geometry aids chip evacuation in short-flute configurations where chip packing is a common failure mode.

Key Features

• Wire gauge size 59 — 1.04 mm (0.0409 inches) cutting diameter for micro-precision hole making
• 120-degree point angle provides a standard included angle suited to general-purpose drilling in a wide range of materials
• Solid carbide construction delivers rigidity and wear resistance at small diameters where high-speed steel tools deflect
• Bright uncoated finish maintains dimensional accuracy in applications sensitive to coating-induced diameter variation
• Right-hand cut, regular spiral flute with straight-cylindrical shank for compatibility with standard collet and chuck systems
• Miniature series design — 30 mm OAL with 8 mm flute length keeps the tool stiff and reduces runout at high RPM

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide micro drill bit for miniature series drilling applications requiring a wire gauge size 59 diameter in collet or chuck holders accepting a 1.50 mm straight-cylindrical shank.

Installation Notes

Solid carbide micro drills are brittle at this diameter and must be run at appropriate spindle speeds with minimal runout in the holder — use precision collets rather than keyed chucks where possible. Always verify shank seating depth and collet concentricity before operation. Do not force-feed; solid carbide at sub-1.5 mm diameters will snap under axial overload. Ensure chip evacuation is adequate, especially in blind-hole applications where peck drilling cycles are recommended.