The shaft may be the prolonged metal rod of the screw that prospects from the head to some extent. This can be threaded completely or partly which has a ridge to screw into resources or make pilot holes. There's also types of screws with flat bottoms that are supposed to be tapped into holes rather than screwed. They have uniform threads, and are

A U-push screw contains a helical thread with an angle acute sufficient for being driven by a hammer or tension from an arbor press, and so has a domed head without having implies of turning it.[90] they are most frequently driven into plastics that has a pre-drilled pilot hole. See also[edit] Hex screw heads are of two types—external and inside