SAE Standards Works
A-6C2 Seals Committee
AS5798A - Aerospace Size Standard for Oversize O-rings
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Torben A. Andersen
Aerospace Size Standard for Oversize O-rings
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 document has been determined to contain basic and stable technology which is not dynamic in nature.