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. Size : 1/4 Type : Helical Flute, Internal Threads Cutting Dia. (In.) : 0.187 Flutes : 3 Finish : polished Pitch : 36 TPI Application : All Types of Metals, Composites and Tough-to-Machine Materials For Use With : - Overall Length : 2-1/2 in End Mill Material : Carbide Nomenclature : TM Item : Thread Mill Thread Size : 1/4-36 Cutting Dia. : 0.187 Overall Length (In.) : 2.5 Length of Cut (In.) : 0.513 Length of Cut : 0.5110 in Shank Dia. : 1/4 in Thread Type : Inch Shank Length : 1.9890 in List Number : TM Drilling Tool Configuration : Individual Cutter Dia. - Machining : 0.1870 Number of Flutes : 3 Measurement System : Fractional Inch Primary Material Application : Composite Finish - Machining : Bright (Uncoated) Cutter Dia. : 0.1870 in Material - Machining : Carbide Series : SPTM Flute Type : Helical Material Applications : Composite, Steel Thread Standard : UN Country of Origin (subject to change) : United States