Threads and Its Types

     Thread plays a very important role in the engineering line for manufacturing various items of daily use. In this engineering and scientific age, machines are used every moment at every stage. Without threads, most of the machines cannot be used. Definition of Threads Spiral grooves of equal measurement or shapes made on a round cylindrical article or pipe are known as threads. In other words, spiral grooves of equal pitch and equal depth made on the parallel round cylindrical surface or conical round surface are called threads.   For example, if we take a round stick and wind a piece of wire in angular indication, the wires twist would move ahead on the round stick. The path on which the wire moves ahead is called Helix. Like this helix, the thread is inclined in an angle on a round surface. Threads may be internal or external.   As already mentioned above, the shape or size of thread