(diameter 24 mm) shown for scale.]] Threaded fastener with a shaft article is about shafted threaded fasteners with external threads. See also the article on nut for information about threaded fasteners with internal threads. A screw used as a threaded fastener consists of a shaft, usually cylindrical and in many cases tapering to a point at one end and with a helical ridge or thread formed on it, and a head at one end which can be rotated by some means. The thread is essentially an inclined plane wrapped around the shaft. The thread mates with a complementary helix in the material. The material may be manufactured with the mating helix using a tap, or the screw may create it when first driven in (a self-tapping screw). The head is specially shaped to allow a screwdriver or spanner) to rotate the screw, driving it in or releasing it. The head is of larger diameter than the body of the screw and has no thread so that the screw can not be driven deep

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # TAGS