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  2. ABEC scale - Wikipedia

    en.wikipedia.org/wiki/ABEC_scale

    Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.

  3. Ball (bearing) - Wikipedia

    en.wikipedia.org/wiki/Ball_(bearing)

    Silicon nitride bearing balls, in diameters ranging from 1 to 20mm. Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings, but also used as components in things like freewheel mechanisms. The balls themselves are commonly referred to as ball bearings. [1] This is an example of a synecdoche.

  4. 20 mm caliber - Wikipedia

    en.wikipedia.org/wiki/20_mm_caliber

    20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.

  5. Rheinmetall Mk 20 Rh-202 - Wikipedia

    en.wikipedia.org/wiki/Rheinmetall_Mk_20_Rh-202

    The Rheinmetall Mk 20 Rh-202 (short for Maschinenkanone 20 mm Rheinmetall) is a 20 mm caliber autocannon designed and produced by Rheinmetall. It fires the 20×139mm ammunition originally developed for the Hispano-Suiza HS.820.

  6. 20×138mmB - Wikipedia

    en.wikipedia.org/wiki/20×138mmB

    The 20×138mmB or Long Solothurn cartridge is a type of ammunition used mainly for anti-aircraft and anti-tank weapons during World War II.The designation means the caliber is 20 mm, the length of the cartridge case is 138 mm and B indicates it is a belted case.

  7. Bottom bracket - Wikipedia

    en.wikipedia.org/wiki/Bottom_bracket

    Because of the relatively small 1.37″ (34.9 mm for ISO, or 36 mm for shells threaded to the Italian standard) diameter shell, designs that place the bearings inside the shell can either have large bearings and a thinner spindle, which lacks stiffness, or smaller bearings and a thicker spindle (such as the original Shimano Octalink), which ...

  8. Oerlikon 20 mm cannon - Wikipedia

    en.wikipedia.org/wiki/Oerlikon_20_mm_cannon

    The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used. [2] [3]

  9. DN factor - Wikipedia

    en.wikipedia.org/wiki/DN_Factor

    It can also be used to determine if a bearing is the correct choice for use in a given application. [3] It is a product of bearing diameter (D) and speed (N). [1] [2] D = diameter (in millimeters) of the bearing in question. For most types of bearings, there are actually two required measurements: the inner diameter and outer diameter.

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