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  2. Positive locking device - Wikipedia

    en.wikipedia.org/wiki/Positive_locking_device

    A hex nut or cap screw and a tab washer; 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 ...

  3. Nyloc nut - Wikipedia

    en.wikipedia.org/wiki/Nyloc_nut

    Nyloc nut. A nyloc nut, also referred to as a nylon-insert lock nut, polymer-insert lock nut, or elastic stop nut, is a kind of locknut with a nylon collar that increases friction on the screw thread. The nylon collar insert is placed at the end of the nut, with an inner diameter (ID) slightly smaller than the major diameter of the screw.

  4. Deadbolt - Wikipedia

    en.wikipedia.org/wiki/Deadbolt

    Door with two locks, one in the doorknob and a separate deadbolt. A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. [1] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle.

  5. Acorn nut - Wikipedia

    en.wikipedia.org/wiki/Acorn_nut

    An acorn nut. An acorn nut, also referred to as crown hex nut, blind nut, cap nut, domed cap nut, or dome nut (UK), is a nut that has a domed end on one side. When used together with a threaded fastener with an external male thread, the domed end encloses the external thread, either to protect the thread or to protect nearby objects from contact with the thread.

  6. Blast shelter - Wikipedia

    en.wikipedia.org/wiki/Blast_shelter

    The usual design is a trap-door, to minimize the size and expense. In dual-purpose shelters, which have a secondary peacetime use, the door may be normal. To reduce the weight, the door is normally constructed of steel, with a fitted steel lintel and frame welded to the steel-reinforcement of the concrete.

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