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SAE AS5798 2007 Edition, July 1, 2007
Aerospace Size Standard for Oversize O-rings
Description / Abstract:
This SAE Aerospace Standard (AS) is applicable to military and
commercial aircraft. It specifies the dimensions, tolerances and
size codes (dash numbers) for use in glands per MIL-G-5514 where
squeeze at low temperature is often insufficient to provide a
leak-tight seal. The dimensions and tolerances specified in this
standard are suitable for any elastomeric material.
This standard should not be used as a part standard, therefore no part numbers like AS5798-001X shall be created.
Each dash number, which should be appended to an appropriate drawing or standard number, identifies one size O-ring only. An AS5798 sized O-ring is intended to replace an AS568 sized O-ring of the same dash number. An X suffix is part of the dash number to signify oversize.
Temperature limitations of 275 °F (135 °C) and coefficient of thermal expansion of 9.0 x 10-5 unit length per °F (1.6 x 10-4 unit length per °C) were used for swell calculations. Applications that exceed these values should be evaluated for excessive gland fill.
This standard should not be used as a part standard, therefore no part numbers like AS5798-001X shall be created.
Each dash number, which should be appended to an appropriate drawing or standard number, identifies one size O-ring only. An AS5798 sized O-ring is intended to replace an AS568 sized O-ring of the same dash number. An X suffix is part of the dash number to signify oversize.
Temperature limitations of 275 °F (135 °C) and coefficient of thermal expansion of 9.0 x 10-5 unit length per °F (1.6 x 10-4 unit length per °C) were used for swell calculations. Applications that exceed these values should be evaluated for excessive gland fill.
SAE AS5798 2007 Edition, July 1, 2007
Aerospace Size Standard for Oversize O-rings