rolled thread

rolled thread
Rolled threads are cold formed by squeezing the blank between reciprocating or revolving serrated dies, similar to rolling a pencil between your two hands. This acts to increase the major diameter of the thread over and above the diameter of the unthreaded shank, if any. Rolled threads are both stronger and smoother than cut threads and more economical in so far as the process is faster with no waste of material. Virtually all cold headed fasteners within the Aerospace Industry today have rolled threads.

Dictionary of automotive terms. 2015.

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