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  2. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    P4/S4 or 4 mm: 1:76.2: 18.83 mm (0.741 in) Uses a track gauge of 18.83 mm which represents an exact scaling down of the prototype at 4 mm to 1 ft scale. P4 contains an allowance for the tighter curves found on model railways in the wheel back-to-back and related dimensions.

  3. DIN 43700 - Wikipedia

    en.wikipedia.org/wiki/DIN_43700

    1/2 DIN: 7.28" × 3.64" [184 mm × 92 mm] 1/4 DIN: 3.64" × 3.64" [92 mm × 92 mm] 1/8 DIN: 3.64" × 1.78" [92 mm × 45 mm] 1/16 DIN:

  4. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length. A 1 / 8 in (3.175 mm) diameter drill can drill a hole 1 + 5 / 8 in (41.275 mm) deep, since it is 13 times the diameter in flute length. [3]

  5. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Very close to wargaming 20 mm figure scale (20 mm is actually 1:80.5). [10] 1:76.2: 4 mm: Model railways (00) UK model rail scale 4 mm scale (OO Scale, etc.). 1:76: 4.011 mm: Model railways (00) Military models. Military vehicles. Used with 4 mm to 1 foot models as well. 1:75: 4.064 mm Used by Heller for model ships. Also some Japanese aircraft ...

  6. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    In mathematics, the infinite series ⁠ 1 / 2 ⁠ + ⁠ 1 / 4 ⁠ + ⁠ 1 / 8 ⁠ + ⁠ 1 / 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1.

  7. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Example (metric fine): For M7.0×0.5, major minus pitch yields 6.5, which at 92.9% happens to be an example that pushes over the outer bound of the 90% ± 2 pp, but major minus pitch is still valid, although smaller drills (6.3 mm, 14, 6.4 mm) will work well.

  8. British Standard Pipe - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Pipe

    British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external thread with an internal (female) thread.

  9. Graduation (scale) - Wikipedia

    en.wikipedia.org/wiki/Graduation_(scale)

    A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.