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Hougen's spiral flute tap is designed for superior performance in tapping applications such as machine shops or automotive repair requiring the utmost precision and accuracy. It features a diameter of 1/4-28 UNF with three flutes to facilitate efficient chip removal while maintaining accurate thread formations on stainless steel, brass, aluminum, or steel materials. Made from Powdered Metal for superior balance preventing breakage or skating during use and ensuring dimensional accuracy when drilling through the material quickly reducing fatigue. This Hougen tap comes with a 3BX class of fit to provide an excellent seal as it threads the metal while its TiCN & TiN coating improves lubrication allowing for smooth threading along with superior surface finishes on various applications requiring spiral flute taps.