High Precision Tungsten Carbide Drill Bits 2F/3F with Inner Coolant for CNC Milling

When you're running a production batch of die steel molds hitting HRC 60 and the chip evacuation starts clogging, these bits just keep without sticking. The internal coolant channels push fluid straight to the edge—no guesswork on whether the heat is building up.

We've got diameters form 1mm all way up to 20mm and lengths spanning 50 to 310mm, so pretty much any CNC pocket or deep hole you're drilling is covered. Coating options are TiSi, AlTi, AlTiSi, AlCr, and AlCrSi—basically pick your poison base on whether you're pushing stainless or hardened tool steel at high speed. Hardness ratings run HRC 45, 55, 60, 65, and 68 if you're dialing in exact material specs.

What it does is cut cleaner than most standdard carbide with no nano coating—we've seen tool life extend noticeably on those long stainles runs, especially in production shops that hate stopping for tool changes. And the 2F and 3F flute configurations let you trade chip removal speed for edge strength depending on what your customer is demanding.

These are AISI standard twist drills, so they fit any common collet or holder you're already using—no adapter headaches. The 100% new tungsten carbide (not recycled scrap) gives them a consistent grain structure that holds up better than cheaper imports, but you're paying close to commodity pricing anyway.

One limitation: they're not suited for aluminun or composites—teh nano coatings and flute geometry work best on hardened steels and stainless. We carry stock on common diameters (usually 3-20 days lead time), but confirm availability for anything under 3mm or over 18mm.