The purpose of this specification sheet is to set up a standardized part numbering system for o-rings procured to MIL-R-83248, Class 2 (90 ± 5 hardness).
The purpose of this specification sheet is to set up a standardized part numbering system for o-rings procured to MIL-R-83248, Class 1 (75 ± 5 hardness).
This standard establishes the dimensional and visual quality requirements, lot requirements, and packaging and labeling requirements for back-up rings machined from AMS3678/1 polytetrafluoroethylene materials for use in AS5202 ports. It shall be used for procurement purposes.
This SAE Aerospace Standard (AS) specifies solid polytetrafluoroethylene (PTFE) retainers (backup rings) for use in static glands in accordance with AS5857. They are usually for use in hydraulic and pneumatic systems as anti-extrusion devices in conjunction with O-rings and other seals.