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  2. List of rail transport modelling scale standards - Wikipedia

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

    Using 32 mm (1.26 in) - 0 gauge - track, there is an extensive range of 16 mm to the foot scale [1:19] live-steam and other types of locomotives, rolling stock and accessories. Many of these models are dual gauge, and can be converted to run on 45 mm ( 1.772 in ) track ( gauge 1 ), and radio control is common.

  3. British Standard Fine - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Fine

    British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on and in much of Britain's machinery, including cars, prior to adoption of Unified, and later Metric, standards.

  4. 5-inch/54-caliber Mark 42 gun - Wikipedia

    en.wikipedia.org/wiki/5-inch/54-caliber_Mark_42_gun

    United States naval gun terminology indicates the gun fires a projectile 5 inches (127.0 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.) [1] In the 1950s a gun with more range and a faster rate of fire than the 5"/38 caliber gun used in World War II was needed, therefore, the gun was created ...

  5. 5-inch/54-caliber Mark 45 gun - Wikipedia

    en.wikipedia.org/wiki/5-inch/54-caliber_Mark_45_gun

    The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount. [1] It was designed and built by United Defense , a company later acquired by BAE Systems Land & Armaments , which continued manufacture.

  6. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    The posts are each 0.625 inches (15.88 mm) wide, and are separated by a gap of 17.75 inches (450.85 mm), giving an overall rack width of 19 inches (482.60 mm). The posts have holes in them at regular intervals, with both posts matching, so that each hole is part of a horizontal pair with a center-to-center distance of 18.312 inches (465.12 mm).

  7. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres (⁠ 1 / 1 000 ⁠ m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).

  8. Floppy disk - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk

    Floppy disk size is often referred to in inches, even in countries using metric and though the size is defined in metric. The ANSI specification of 3½-inch disks is entitled in part "90 mm (3.5-inch)" though 90 mm is closer to 3.54 inches. [49] Formatted capacities are generally set in terms of kilobytes and megabytes.

  9. M2 Browning - Wikipedia

    en.wikipedia.org/wiki/M2_Browning

    12.7 × 99 mm Browning M2HB machine gun; ranging gun L21A1 12.7 × 99 mm Browning M2HB machine gun; ranging gun for the 120 mm tank gun on the Chieftain tank: L111A1 [131] 12.7 × 99 mm M2QCB machine gun M3M [132] 12.7 × 99 mm FN Herstal built upgraded M2 for use on Commando Helicopter Force and other units as helicopter door guns.