Thread mills from Grainger are cutting tools used for thread milling operations to produce internal or external threads in workpieces. They feature multiple cutting edges and are available in a range of sizes, thread forms, materials, coatings, and shank types to suit different machining applications. Common materials include high speed steel, cobalt, and carbide. They allow single pass threading, provide accurate lead control, and produce excellent thread surface finishes. Overall, Grainger offers a broad selection of quality thread mills to meet various threading needs.