What does AS 568 mean?

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What does AS 568 mean?
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• It is important for molded rubber products to
  have certain standards. O-rings are no exceptions
  and there is something called an Aerospace Size
  Standard for O-Rings AS 568. It is a US standard
  for O-rings that came into being by the Society
  of Automative Engineers (SAE). As per this
  system, a dash - is used to refer to O-ring
  sizes that are standardized.
• The main benefit of having standardized system is
  that the engineers can make use of the standard
  O-ring sizes to build prototypes and test their
  designs. They would know the size of standard
  O-rings and they would not have to measure it
  every time. This brings a sense of uniformity.
  The Aerospace Standard mentions the
  cross-sections, inside diameters tolerances and
  size identification codes for O-rings that are
  put to use in sealing applications.

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• Talking about the uses of custom molded rubber
  products like O-rings, they are used in the
  manufacturing world extensively. The biggest use
  of o-rings is that as an oil seal.
• You must note that you can get standard O-ring
  sizes in different materials. The most common
  materials used to make o-rings are Nitrile,
  Neoprene, Butyl, Silicone, Fluorosilicone,
  Fluorocarbon, and EPDM.
• AS 568 is Aerospace Size Standard for O-Rings to
  help engineers build prototypes and test designs.
  O-rings are used widely in the manufacturing
  world.

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