Grainger.com

These helical-flute thread mills have a bright finish that provides a smooth, polished surface. They are suitable for general purpose applications at slower speed in nonferrous materials. The thread mills are made from carbide, which offers excellent wear resistance, heat resistance, and hardness. Helical-flute thread mills have spiral flutes that distribute the chip load as the thread mill removes material to cut threads into an existing hole or onto the external surface of a part. They provide a smoother cut than straight-flute or single-profile thread mills and are used to create threads on tough or thin-walled materials. Helical-flute thread mills can create internal threads of the same pitch in a range of hole diameters, eliminating the need to change tools when threading multiple holes of different sizes. Thread mills are only usable in CNC machines that have helical interpolation capability. This listing is for each. Thread Type : Inch Type : Helical, Internal or External For Use With : - Flutes : 3 Thread Size : 5/16-18 Finish : polished Length of Cut : 0.6890 in Length of Cut (In.) : 0.689 Overall Length : 2-1/2 in Size : 5/16 Overall Length (In.) : 2.5 Item : Thread Mill Cutting Dia. : 0.235 Nomenclature : TM Cutting Dia. (In.) : 0.235 Pitch : 18 TPI End Mill Material : Carbide Application : All Types of Metals, Composites and Tough-to-Machine Materials Shank Dia. : 1/4 in Measurement System : Fractional Inch Number of Flutes : 3 Material Applications : Composite, Steel Material - Machining : Carbide Cutter Dia. - Machining : 0.2350 List Number : TM Drilling Tool Configuration : Individual Shank Length : 1.8110 in Primary Material Application : All Materials Finish - Machining : Bright (Uncoated) Cutter Dia. : 0.2350 in Flute Type : Helical Series : SPTM Thread Standard : UN Country of Origin (subject to change) : United States