Collet Adapter, 3MT to 3C

The concentricity spec on this adapter is no joke—my test indicator barely moved when I chucked up a 3C collet in my 3MT spindle. Fit is snug and true, exactly what I needed for some precision work.

The 0.0002" concentricity spec is no joke—my test indicator barely moved when I checked it in the spindle. I've been using it with 3C collets for a few days now, and the grip feels rock solid on every part I've run through it.

The bore on this adapter lines up dead true with the taper—no runout I can measure with my indicator. Fit onto the 3MT spindle is snug and the 3C collets seat without any slop, so my workpieces are coming off round.