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2. Positive locking device - Wikipedia

   en.wikipedia.org/wiki/Positive_locking_device

   A hex nut or cap screw and a lock plate; Safety wiring with various types of fasteners; 7-122. GENERAL. The word safetying is a term universally used in the aircraft industry. Briefly, safetying is defined as: "Securing by various means any nut, bolt, turnbuckle etc., on the aircraft so that vibration will not cause it to loosen during operation."

3. Plate nut - Wikipedia

   en.wikipedia.org/wiki/Plate_nut

   These locking plate nuts are used when the nut is subjected to constant changes in environment or to vibration. The nylon insert expands and stops vibrations of the nut and acts as a locking arrangement. Other types have a floating nut or replaceable locking elements. [3] A typical U.S. military specification for plate nuts is MS21047. [4]

4. Locknut - Wikipedia

   en.wikipedia.org/wiki/Locknut

   Jet nut (K-nut) [4] Keps nut (K-nut or washer nut) with a free-spinning washer. In the locknut form, this is a star-type lock washer. Plate nut; Polymer insert nut ; Security locknut All steel reusable nut for high vibration and harsh environments. Serrated face nut; Serrated flange nut; Speed nut (sheet metal nut or Tinnerman nut)

5. Jesus nut - Wikipedia

   en.wikipedia.org/wiki/Jesus_nut

   The Main rotor attach nut, or "Jesus nut", from a Bell 222U, shown in hand for size perspective (left) and installed with locking key (right). Jesus nut is a slang term for the main rotor retaining nut [1] or mast nut, which holds the main rotor to the mast of some helicopters.

6. Dzus fastener - Wikipedia

   en.wikipedia.org/wiki/Dzus_fastener

   The Dzus fasteners (gold coloured circular objects) fastening the cowling panels of the 1930s Hawker Hind. The Dzus fastener, also known as a turnlock fastener or quick-action panel fastener, [1] is a type of proprietary quarter-turn spiral cam lock fastener often used to secure skin panels on aircraft and other high-performance vehicles.

7. Cleco (fastener) - Wikipedia

   en.wikipedia.org/wiki/Cleco_(fastener)

   Cleco (Cleko) fasteners on an aircraft wing. A cleco, also spelled generically cleko, is a temporary fastener developed by the Cleveland Pneumatic Tool Company. [1] Widely used in the manufacture and repair of aluminum-skinned aircraft, it is used to temporarily fasten sheets of material together, or to hold parts such as stiffeners, frames etc together, before they are permanently joined.