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  2. Orders of magnitude (length) - Wikipedia

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

    6.371 Mm – global-average Earth radius; 6.4 Mm – length of the Great Wall of China; 7.821 Mm – length of the Trans-Canada Highway, the world's longest national highway (from Victoria, British Columbia, to St. John's, Newfoundland) 8.836 Mm – road distance between Prudhoe Bay, Alaska, and Key West, Florida, the endpoints of the U.S. road ...

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    6.096 mm Many European die-cast construction vehicles and trucks. Some early Japanese aircraft kits are also of this scale, and it is the standard scale for hand-crafted wooden aircraft models in Japan. Common scale for architectural modelling. 1:48: 1 ⁄ 4 in: 6.350 mm: Aircraft models. Dollhouse. Military models. Wargaming

  4. 6×45mm - Wikipedia

    en.wikipedia.org/wiki/6×45mm

    As a testament to the 6×45mm's accuracy, Jim Stekl, who at that time managed Remington's custom shop and developer of the .22 BR cartridge, scored an aggregate record of .3069 inches (7.80 mm) in the 1973 IBS 200 yard Sporter category.

  5. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  6. .50 Beowulf - Wikipedia

    en.wikipedia.org/wiki/.50_Beowulf

    1.65 in (42 mm) Overall length: 2.125 in (54.0 mm) Primer type: Large pistol magnum: Maximum pressure: 33,000 psi (230 MPa) Ballistic performance; Bullet mass/type

  7. M42 lens mount - Wikipedia

    en.wikipedia.org/wiki/M42_lens_mount

    It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch. (The M42 lens mount should not be confused with the T-mount , which shares the 42 mm throat diameter, but differs by having a 0.75 mm thread pitch.)

  8. 5.8×42mm - Wikipedia

    en.wikipedia.org/wiki/5.8×42mm

    The Chinese armaments industry and the Chinese military were informed about the developments and experience that the US armed forces had during the Vietnam War with the M16 rifle and its 5.56×45mm M193 ammunition – not least because of the arms aid for Vietnam, as a result of which there was a high probability that captured US small arms and ammunition reached China.

  9. Hotchkiss gun - Wikipedia

    en.wikipedia.org/wiki/Hotchkiss_gun

    The 1.65-inch (42 mm) gun and accessories could be packed on two mules. The gun was introduced as a modern replacement for the aging twelve-pounder mountain howitzer.The first gun purchased by the U.S. military from the French arms firm of Hotchkiss was employed against the Nez Percé in 1877.