Long Neck End Mill

Common end mill length is composed by two parts, cutting flute length and shank length, the cutting flute diameter is very small, below 1mm or 1-3mm, smaller than shank diameter (shank is 4mm or 3.175mm), there is one cone section length connecting the small diameter and shank, we call it neck. The long neck has a long neck as the name indicates, the long neck can avoid the interference between end mill and the workpiece, which is the very important point when mill a deep groove, so the long neck end mill is very good for deep groove milling, also named Deep Groove End Mill.