970 Series

Tool 970i4008C

The 970i4008C is a 5/8" keyseat cutter from the 970 Series, for keyways and woodruff key slots in aluminum. This version cuts a 0.125" (1/8") wide slot and has 8 flutes.

The head cuts a slot below the surface that a standard end mill can't reach, while the narrower neck passes through the opening above it.
The staggered cut keeps chatter down, and the dished front and rear faces keep the cutter from dragging.
Behind the head, the neck steps down to 0.3125" for longer reach.
You clamp a 5/8" shank that Sonic grinds to h6 for precision tool holders and leaves unpolished to help it resist slipping.
TiB2 resists aluminum sticking to the edge, so you can run higher speeds and feeds than with an uncoated tool.
For steel, the 970i4008B is the same tool in AlTiN.