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  2. Universal joint - Wikipedia

    en.wikipedia.org/wiki/Universal_joint

    Ephriam Shay's locomotive patent of 1881, for example, used double universal joints in the locomotive's drive shaft. [15] Charles Amidon used a much smaller universal joint in his bit-brace patented 1884. [16] Beauchamp Tower's spherical, rotary, high speed steam engine used an adaptation of the universal joint c. 1885. [17]

  3. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V, but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H = ⁠ 5 / 8 ⁠ cos(30°) P ≈ 0.541P to 0.52P. [5] This increases the amount of the theoretical sharp V which is cut off at the minor diameter by 10% from 0.25H to ⁠ 7 / 8 ⁠ − ⁠ 0. ...

  4. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    For example, a 1 ⁄ 4-inch to 38-inch adapter allows sockets with 1 ⁄ 4-inch drive holes to attach to a 38-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the wrench and socket. They are used with extensions ...

  5. Sewing machine needle - Wikipedia

    en.wikipedia.org/wiki/Sewing_machine_needle

    The universal class of needles are used on domestic machines. "Universal" refers to the shape of the needle shank and length of the needle rather than the actual sewing application or point. The most notable feature of universal needles is the flat face on the needle shank which helps to ensure the needle is inserted correctly.

  6. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

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