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  2. British Association screw threads - Wikipedia

    en.wikipedia.org/wiki/British_Association_screw...

    A 2BA thread is used to connect the metal barrel of a dart to its shaft — as such, it is one of the few common uses of this thread in North America. In the UK, 2BA threads are commonly found in the old imperial British Engineering Standards Association (BESA) conduit boxes , and 4BA threads in light switch and socket back boxes which are ...

  3. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    ASME B1.1-2003 (R2018) Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 14 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread ...

  4. Plumbata - Wikipedia

    en.wikipedia.org/wiki/Plumbata

    Four plumbatae heads from the 4th or 5th century AD, found in Enns, Austria.The wooden shafts and fletching have decayed. [1]Plumbatae or martiobarbuli were lead-weighted darts carried by infantrymen in Antiquity and the Middle Ages.

  5. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    The Whitworth thread was the world's first national screw thread standard, [1] devised and specified by Joseph Whitworth in 1841. Until then, the only standardization was what little had been done by individual people and companies, with some companies' in-house standards spreading a bit within their industries.

  6. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than ⁠ 1 / 4 ⁠ inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.

  7. Spear-thrower - Wikipedia

    en.wikipedia.org/wiki/Spear-thrower

    Dart shafts can be made thinner and highly flexible for added power and range, the fletching can be spiralized to add spin to the dart making it more stable and accurate. Darts resemble large arrows or small spears and are typically from 1.2 to 2.7 m (4 to 9 ft) in length and 9 to 16 mm (3/8" to 5/8") in diameter.

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