220 Series

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The 220 Series is Sonic's 2-flute ball nose solid carbide end mill for aluminum, copper, and plastics. Ball nose geometry is correct for contoured surfaces, 3D toolpaths, and radius features where a flat end mill produces steps. Two flutes leave the chip room aluminum needs in slots and 3D contour passes, where depth and direction change constantly. Sonic grinds the ball form to 0.0002" lineform accuracy.

Sonic offers the 220 in TiB2. TiB2 has a low affinity for aluminum, so less material builds up on the edge. Sonic grinds every shank to h6 for precision holders and leaves a ground finish, not a polished one, so the shank resists slipping. Every tool is engraved with its lot number for traceability.