The bolt is a junction, removable, between two mechanical parts, formed by a cylindrical shaft called screw and nut. The coupling of the connecting parts is effected by drilling them through the common hole through the two pieces with a screw and by coupling it with a nut located on the opposite side. Normally, the screw is hexagon head or more rarely, cylindrical head with hexagon head (hexagon) or square or flared. The die usually has a hexagonal shape and has a hole in which a thread is complementary to that of the screw. The holes in the joints to be joined must not be threaded, and must allow the bolt to slide freely. The thread of the screw normally does not exist throughout its length, since it does not have any usefulness in the inner area of the thickness of the materials. It often does not have the body completely threaded to give greater resistance to cutting.
If from the point of view of the technical definition the bolt term identifies the coupling of screw and nut, in the common language, and even in some technical texts of the past, it is not uncommon for this term to be identified with vine or only the dice. The term comes from the French boulon.
The characteristic bolt data is the diameter and the length. The diameter is equal to the outer diameter of the thread, which is the same as the non-threaded cylindrical part. The length is that of the stem, with the exception of the flared head bolts in which the length also includes the head. In the bolted joint, the bolt can be assimilated to a spring that compresses the two contact surfaces by creating a friction preventing it from sliding. Therefore, the junction is not secured by the presence of the bolt that prevents cutting, since the bolt stem should not even touch the edges of the hole in which it is inserted. If sliding occurs between the two contact surfaces the junction is considered to be destroyed.
#bolt
- Comments
