OSG Threading Tap - NPT Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 3/4 x 14Precision internal threads for NPT pipe connections in blind holesthe OSG Spiral Flute Threading Tap is built for machinists who demand durable, accurate 3 4" 14 threads in challenging materials. Thread Type: NPT, 3 4" 14, designed for standard pipe fittings and leak tight joints in blind hole applications. Material: HSS E (high speed steel with cobalt) for exceptional hardness, wear resistance, and heat tolerance. Coating: Steam oxide coating to