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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    The 85% and 90% rules works best in the range of 141 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have ...

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Original nominal 25 mm figure scale; though a 6-foot human in 1:87 is closer to 21 mm. 1:82: 3.717 mm An intermediate scale (HO/OO) intended to apply to both HO and OO scale train sets. Also used for some military models 1:80: 3.810 mm HOj scale. Very close to wargaming 20 mm figure scale (20 mm is actually 1:80.5). [10] 1:76.2: 4 mm: Model ...

  4. List of rail transport modelling scale standards - Wikipedia

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

    While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm (0.65 in) gauge from real life prototype 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.

  5. Ten and a quarter inch gauge - Wikipedia

    en.wikipedia.org/wiki/Ten_and_a_quarter_inch_gauge

    Ten and a quarter inch gauge (or X scale) (10 + 14 in / 260 mm) is a large modelling scale, generally only used for ridable miniature railways. Model railways at this scale normally confine the scale modelling aspects to the reproduction of the locomotive and with steam locomotives the accompanying tender .

  6. Rail transport modelling scales - Wikipedia

    en.wikipedia.org/wiki/Rail_transport_modelling...

    The scale of 1:24 in combination with 45 mm (1.772 in) track is an attempt to model North American and UK 3 ft (914 mm) narrow-gauge or 3 ft 6 in (1,067 mm) gauge trains in better proportion to the rails they run on. 2 gauge: 1:29: 50.4 mm or 45 mm

  7. Standard-gauge railway - Wikipedia

    en.wikipedia.org/wiki/Standard-gauge_railway

    The 4 ft 9 in (1,448 mm) railways were intended to take 4 ft 8 + 1 ⁄ 2 in (1,435 mm) gauge vehicles and allow a (second) running tolerance. The Chester and Birkenhead Railway , authorised on 12 July 1837, used 4 ft 9 in ( 1,448 mm ).

  8. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  9. 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.