120 Series

Tool 120i156LFA

The 120i156LFA is a 5/32" 3-flute ball nose from the 120 Series, for contoured surfaces and cavities in steel, iron, titanium and nickel alloys. The F in the part number means a reduced neck behind the flutes, so you reach 1.000" from the tip, deeper than its 0.469" length of cut.

On contoured surfaces and radial features, the ball leaves a small scallop you size with your stepover, where a flat end mill leaves steps.
At the same feed rate and spindle speed, three flutes take a thinner chip per edge than a 2-flute ball, which matters in hard materials, where chip load per tooth decides edge life.
The ball radius is 0.0781", and Sonic grinds its profile to a lineform accuracy of 0.0002".
The end is center cutting, and Sonic shapes the center to reduce marking on the part.
You clamp a 1/4" shank, stiffer than a 5/32" one, and get the reach from the neck.
The TiAlSiN coating is built for heat: it holds up to 1000°C and its low-friction surface cuts down wear.