“The most common and the worst mistake beginners ... Shank: The smooth area of the fastener between the head and the thread. Screw types vary and some screws do not have a smooth shank.

and the shape of the projection determines the mechanical properties of the screw. The most common thread profile is the simple V thread, with opposing faces of the thread forming an angle of 60°.

The most common type of this fastener has a built-in ... the built-in washer does that for you. A sheetmetal screw has sharp threads and a reasonably sharp tip that cuts into the material into ...