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  2. TO-5 - Wikipedia

    en.wikipedia.org/wiki/TO-5

    The tab is located 45° from pin 1, which is typically the emitter. The typical TO-5 package has a base diameter of 8.9 mm (0.35 in), a cap diameter of 8.1 mm (0.32 in), a cap height of 6.3 mm (0.25 in). [1] The pins are isolated from the package by individual glass-metal seals, or by a single resin potting.

  3. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units .

  4. Skinny triangle - Wikipedia

    en.wikipedia.org/wiki/Skinny_triangle

    A target 1 metre in height and measuring 1 mil in the sight corresponds to a range of 1000 metres. There is an inverse relationship between the angle measured in a sniper's sight and the distance to target. For instance, if this same target measures 2 mils in the sight then the range is 500 metres. [7]

  5. .177 caliber - Wikipedia

    en.wikipedia.org/wiki/.177_caliber

    It is also used in field target competitions, where it competes with .20 caliber (5 mm) and .22 caliber (5.6 mm) rifles. Steel BBs are typically slightly smaller than lead BBs at 0.175-inch (4.4 mm) diameter, although the bore diameter of the barrel are the same. Some air guns are designed to accept .177 pellets, .177 lead shot, or .175 steel ...

  6. 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).

  7. BB gun - Wikipedia

    en.wikipedia.org/wiki/BB_gun

    BB pistol with CO 2 cartridges and BBs. A BB gun is a type of air gun designed to shoot metallic spherical projectiles called BBs (not to be confused with similar-looking bearing balls), which are approximately the same size as BB-size lead birdshot used in shotguns (0.180 in or 4.6 mm in diameter).

  8. .300 H&H Magnum - Wikipedia

    en.wikipedia.org/wiki/.300_H&H_Magnum

    62.87 mm (2.475 in) Height to belt: E. 5.59 mm (0.220 in) ... Significantly the shoulder vertex calculated by the CIP for both cartridges is given as 91.69 mm (3.610 ...

  9. United States Standard thread - Wikipedia

    en.wikipedia.org/wiki/United_States_Standard_thread

    The metric standard used the same thread geometry as the USS standard but differed in that the dimensions and pitch were based on metric units. In 1906, the A.L.A.M developed what would be the SAE thread standard for threaded fasteners based on the USS standard but with a finer thread pitch.