Aerospace Rod Scraper Gland Design Standard
AS4088C
This SAE Aerospace Standard (AS) defines gland details for rod diameters from 1/4 to 15-1/2 in. inclusive corresponding to AS568 O-Ring Dash No. sizes -108/-111, -206/-222, -325/-349 and -425/-460.
The gland details herein provide more space than MS33675 and sufficient to fit more efficient and reliable excludion devices.
Exclusion device configurations are not specified in this document.
Rationale:
This specification was created to define gland dimensions for rod scrapers originally using 1 backup width basic groove dimensions to MIL-G-5514F, later AS4716. The 1 backup width provides good part stability along with improved performance compared to the previous MS33678 standard. The significant differences between this standard and AS4716 are the clearance on the atmosphere side of the gland and the size range -104 thru -111 and -206 thru -209 have been extrapolated to provide larger cross section parts than AS4716 allowed.
