200 Series

Tool 200i375M015C

Aluminum work hardens fast when the edge isn't sharp enough or the chip load runs too light. You get that telltale squeal, then built-up edge, then a surface that looks like you dragged sandpaper across it. The corner radius matters more than most realize.

The 200 Series runs three flutes to balance chip load distribution with feed rate maintenance.
Each tooth sees less material per revolution, which reduces the heat and pressure that cause aluminum to weld to the cutting edge.
The R0.015" corner radius strengthens the edge without sacrificing sharpness.
Enough radius to prevent chipping on interrupted cuts, not so much that it burnishes instead of cuts.
TiB₂ coating handles the demanding passes where uncoated tools start to dull.
Hard enough for longer tool life, low enough friction coefficient to let chips evacuate cleanly.