100 Series

Tool 100i500S040A

Most shops know the feeling when an end mill starts chattering mid-cut in 4140. The part tolerance goes out the window, and you're back to programming around tool limitations instead of part requirements.

The 100 Series distributes cutting forces across four flutes, which matters most in interrupted cuts and deep slotting where single-point loading breaks down other geometries.
TiAlSiN coating handles the heat buildup in steel and iron without the brittleness you get from thicker coatings that chip on entry.
The 0.04" corner radius does two things in harder steels and titanium alloys.
It strengthens the cutting edge against microchipping, and it leaves a surface finish that typically eliminates secondary operations.
Half-inch diameter gives you the rigidity for full-width cuts in most steel grades without the deflection problems of smaller tools.