Fasteners are used to join to or more than two things together mechanically. on temporary basis or permanent basis.different types of fasteners are used on board ship are given as followsBoltScrewStudsThreaded Fasteners BOLTBolt is very common fastener used on board ship there are different types of bolts used on ship. Bolt has one ended threaded and other end head, Head may be hexagonal or square. They are generally used with nut.