''A short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things together.'' <ref>https://en.oxforddictionaries.com/definition/screw</ref> <br \>The As can be seen in the image below, the cylindrical portion of the screw from the underside of the head to the tip is known as the shank; it . The shank may be fully threaded or partially threaded. The Pitch is the distance between each thread is called the pitch. <ref>https://books.google.co.in/books?isbn=1317938100</ref><br \>The majority of screws have a right handed thread, meaning that they are tightened by clockwise rotation, which is termed a right-hand thread; a common . A very good mnemonic device for remembering this when working with screws or bolts is '''righty-tighty, lefty-loosey'''.<ref>http://www.solidswiki.com/index.php?title=Screws&mobileaction=toggle_view_mobile</ref>