We can divide manufacturing of threads into 2 type
-manufacturing metal threads
-manufacturing plastic threads
manufacturing metal threads :
Screw threads are normally manufactured by one of three methods
Cutting: The excess material is removed, with taps and dies for smaller diameters, or with a thread-cutting lathe for larger ones.
Rolling: The material is extruded into a thread through mechanical pressure. Common for high-production threads of diameters typically smaller than one inch. A rolled thread is instantly recognizable because the thread has a larger diameter than the blank rod from which it has been made. The threads of bicycle spokes provide a perfect example. Rolled threads tend to be slightly stronger than cut threads.
Casting: Material is either heated to a liquid (or rarely a gas), or dissolved in a liquid that will evaporate and allow the material to solidify (such as plaster or cement). Alternately, the material may be forced into a mould as a powder and compressed into a solid, as with graphite.
Manufacturing plastic threads :
They always use injection molding for make a plastic thread
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