a fastener with no head but it has threads at both ends of the shank

A bolt, threaded on both ends, often used in bolting together bodies and bonnets or bodies and closures.

A double ended bolt or piece of threaded rod. Often used in machine and automotive applications.

(n) A mechanical fastening device that consists of a cylindrical rod threaded on one or both ends and that screws into a mating part. A nut may be used on one end.

The round cylindrical protuberances on a LEGO brick. Also sometimes called a knob.

An ornamental button of various forms, worn in a shirt front, collar, wristband, or the like, not sewed in place, but inserted through a buttonhole or eyelet, and transferable.

The stud is the male half of the snap combination and acts in conjunction with the socket to form a complete snap fastener closure.

a rod threaded on each end

An ornamental knob or boss, rod, pin, or nail with a decorative head. Also a detachable, buttonlike device inserted through one or more holes, buttonholes, or loops, eyelets of any material, meant to serve as a decorative fastener.

A round, bolt-like metal fastener with threads on both ends.

A short rod or pin, fixed in and projecting from something, and sometimes forming a journal.

A stud bolt.

A male threaded captive post that extends from a panel.

A fastener which is threaded at both ends with an unthreaded shank in between. One end (which often has a thread tolerance which results in more thread interference) is secured into a tapped hole, the other is used with a nut.