Milling drill bit Proxxon 28759, 2 mm diameter, single piece

Proxxon 28759 milling drill bit, 2 mm diameter, single piece, is a precision double-flute solid tungsten cutter designed for clockwise cutting in small-scale milling and drilling operations. The fishtail profile enables cutting to the centre, permitting boring as well as peripheral milling. The durable tungsten construction and double-flute geometry make the bit suitable for a range of materials including steel, cast steel, brass, aluminium, glass, plastics and carbon fiber. The bit includes a 7/64" (2.35 mm) shank to fit common micro-milling and micro-drilling tool heads.

Advantages

The solid tungsten construction provides high hardness and wear resistance for extended tool life in precision tasks. Double-flute geometry improves chip evacuation and gives a smoother surface finish on drilled or milled features. The fishtail profile permits centre cutting and boring operations without the need for a separate centre drill. A compact single-piece supply allows selection of the exact diameter required for detailed work and avoids excess inventory. The 2 mm cutting diameter balances rigidity and accessibility for fine features.

Suitable for

• Precision drilling and milling in model making and miniature engineering
• Engraving and detail milling on metal and non-metal materials
• Creating and refining holes and tracks on printed circuit boards
• Working on small assemblies in brass, aluminium and steel components

Key specifications

• Cutting diameter: 2 mm
• Material: solid tungsten (tungsten carbide)
• Flutes: double-flute geometry
• Profile: fishtail, centre cutting for boring
• Cutting direction: clockwise
• Shank diameter: 7/64" (approx. 2.35 mm)
• Supply: single piece

How to use

Install the milling drill bit into a compatible collet or chuck that accepts the 7/64" (≈2.35 mm) shank, ensuring secure clamping and concentric alignment. Use with suitable micro-mill or rotary tool heads rated for small-diameter cutters, and select rotational speeds and feed rates appropriate to the work material: higher speeds for plastics and non-ferrous metals, moderate speeds for aluminium and brass, and lower speeds with light feed for steel and glass. Apply steady, controlled feeds to avoid overheating; use light cutting passes for finishing. Ensure correct clockwise rotation and avoid lateral shock loads that could chip the carbide.

Usage recommendations

For best results, use suitable cutting fluids or air blast cooling when machining metals to extend tool life and improve surface finish. When working with brittle materials such as glass or carbon fiber, reduce speed and use light, incremental passes. Pair the bit with micro-milling machines or drill heads that provide stable support, for example compact micro mills and mill/drill heads designed for 2–2.5 mm shanks.