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2. Barrel nut - Wikipedia

   en.wikipedia.org/wiki/Barrel_nut

   It is used to bolt thin sheet metal parts to larger, often billet or forged, parts. The barrel nut is a round slug, or formed sheet metal part with threads perpendicular to the length of the nut. The nut sits in a hole inside the forging and a standard bolt is threaded into the barrel nut from outside the sheet metal. They are preferred over a ...

3. Sex bolt - Wikipedia

   en.wikipedia.org/wiki/Sex_bolt

   The sex bolt often has a built-in feature, such as a slot, to aid in tightening the fastener. Some sex bolts, more commonly known as "architectural bolts", have knurled barrels to allow one-sided assembly. The sex bolt consists of a female (internally) threaded barrel (nut) and a male (externally) threaded screw.

4. Barrel threads - Wikipedia

   en.wikipedia.org/wiki/Barrel_threads

   Barrel nut Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.

5. Bolt (firearms) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(firearms)

   A telescoping bolt is a bolt that wraps around the breech end of the barrel. This bolt design is often used to reduce overall weapon length without sacrificing barrel length or bolt weight. A turn bolt refers to a firearm component where the whole bolt without using a bolt carrier turns to lock and unlock.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A special type of bolt that is set into concrete, with screw threads protruding above the concrete surface to accept a nut. breakaway bolt: A breakaway bolt is a bolt with a hollow threaded shank, which is designed to break away upon impact. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also used in aircraft ...

7. Rotating bolt - Wikipedia

   en.wikipedia.org/wiki/Rotating_bolt

   Rotating bolt is a method of locking the breech (or rear barrel) of a firearm closed for firing. Johann Nicolaus von Dreyse developed the first rotating bolt firearm, the "Dreyse needle gun", in 1836. The Dreyse locked using the bolt handle rather than lugs on the bolt head like the Mauser M 98 or M16.