Thread Rolling

Thread rolling is a secondary process of creating helical threads by rolling instead of cutting a shaft into the shape of the threads. Two cylindrical dies made of hardened steel with the thread pattern are spun and the shaft to be threaded is fed in between them, with tight spacing so the shaft contacts each die simultaneously. Since the shaft is made of the softer material, it takes the shape of the dies, forming a thread as for far as the shaft is fed into the dies.

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