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  2. 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.

  3. Foamcore - Wikipedia

    en.wikipedia.org/wiki/Foamcore

    Foamcore, foam board, or paper-faced foam board is a lightweight and easily cut material used for mounting of photographic prints, as backing for picture framing, for making scale models, and in painting. It consists of a board of polystyrene foam clad with an outer facing of paper on either side, typically white clay-coated paper or brown ...

  4. Mat (picture framing) - Wikipedia

    en.wikipedia.org/wiki/Mat_(picture_framing)

    While some say that acidic framing materials should be avoided for all but the most temporary frames, it is not safe to say that all "acid-free" mats are recommended for long term preservation use. The hierarchy of mat board quality is as follows: Museum board – The highest quality material available. It is constructed of 100% cotton fiber ...

  5. Cutting mat - Wikipedia

    en.wikipedia.org/wiki/Cutting_mat

    Image of a photo album, where the cutting mat below shows the scale by lines every 10 mm, as well as a color chart being used to document colors. Many cutting mats are plastic sheets in the sizes A4 (297 × 210 mm) or A5 (210 × 148 mm), but there are also larger sheets in A1 (841 × 594 mm, or possibly 900 × 600 mm) or larger. [6]

  6. 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. ...

  7. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    where is the tap drill size, is the major diameter of the tap (e.g., 38 in for a 38-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 38-16 tap). For a 38-16 tap, the above formula would produce 5 ⁄ 16, which is the correct tap drill diameter. The above formula ultimately results in an approximate 75% ...

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