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  2. Positive locking device - Wikipedia

    en.wikipedia.org/wiki/Positive_locking_device

    A wheel hub with a castellated nut secured in the center using a cotter pin to prevent it from unscrewing. A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener.

  3. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    The 'old style' fixed master socket had only one set of terminals on the back and customers were supposed to use extension kits plugged into the front socket; however, many customers hard-wired their own extensions anyway for neatness and robustness reasons, which was a poor arrangement since it provided no way to isolate the customer's ...

  4. Slim jim (lock pick) - Wikipedia

    en.wikipedia.org/wiki/Slim_jim_(lock_pick)

    A slim jim (more technically known as a lockout tool) is a thin strip of metal (usually spring steel) roughly 60 centimetres (24 in) long and about 2–4 centimetres (0.79–1.57 in) wide originally marketed under that name by HPC Inc., a manufacturer and supplier of specialty locksmithing tools.

  5. Pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Pin_tumbler_lock

    The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.

  6. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.

  7. Clevis fastener - Wikipedia

    en.wikipedia.org/wiki/Clevis_fastener

    Threaded clevis pins have a partially threaded shank on one end and a formed head on the other. The formed head has a lip, which acts as a stop when threading the pin into the shackle, and a flattened tab with a cross-hole. The flattened tab allows for easy installation of the pin and the cross-hole allows the pin to be moused. [3]

  8. Modular connector - Wikipedia

    en.wikipedia.org/wiki/Modular_connector

    The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]

  9. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    In addition to the dangers of breaking a ground connection, removing the ground pin to make it fit a 1-15R receptacle or extension cord, may result in the live–neutral polarity being lost. The 5-15R and 5-20R are by far the most common electrical receptacle in North America in buildings built since the mid-twentieth century.