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Threading is one of the most universal, yet complicated machining methods. Taps and dies are the major tools for threading. Taps are for inner threads and dies for outer threads. There are four major kinds of taps including straight flute taps, spiral taps, spiral pointed taps, thread formed taps. About dies, circular screwing dies are popular but hexagonal dies still used in some place
Higred. tools group can provide different kinds of taps and dies as well as relative accessories. Most of them are made of HSS or HSS-E, few of them are made of carbide for special purpose.