Thread mills are cutting tools used for threading operations on CNC machines. They create internal and external threads in metals and plastics. Grainger offers a selection of thread mills including indexable thread mills, solid carbide thread mills, and high speed steel thread mills. They come in various sizes and thread pitches. Thread mills provide accurate, repeatable threading and can be used on a range of materials. Grainger's thread mills are made by quality brands like OSG, Sandvik Coromant, and Kennametal. They offer right hand and left hand threads.