Threaded Joint

(threaded connection), a joining of parts by means of threads. Threaded joints are the most common type of releasable connections, which employ various fastenings to ensure relative immobility of the joined elements of machines and mechanisms. Threaded joints usually use fastenings, such as bolts, screws, and nuts. The strength and durability of threaded joints depend on the design of parts, precision of manufacture, and engineering factors. Threaded joints with taper thread are the type most widely used to join pipes, since this type of thread gives the joints the necessary airtightness.