The MS28778-5 is an aerospace-standard O-ring sealing element used in aircraft hydraulic, fuel, pneumatic, and lubrication systems. It provides a reliable pressure-tight seal between mating components such as fittings, valve bodies, pumps, and actuator housings.

This O-ring is designed for use in demanding aviation environments where sealing performance must be maintained under pressure cycling, vibration, and wide temperature variations. It is commonly used in both static sealing applications and light dynamic interfaces depending on system design.

Manufactured to MS specifications, it is typically made from FKM (Viton-type) or other aerospace-grade elastomer compounds, providing strong resistance to hydraulic fluids, aviation fuels, oils, and environmental degradation.

Key features include:

MS28778-5 aerospace O-ring seal
Used in hydraulic, fuel, and pneumatic systems
Provides leak-proof pressure sealing
Resistant to aviation fluids and oils
Suitable for vibration and cyclic load environments
High temperature and pressure capability
FKM (Viton-type) elastomer construction
Used in valves, fittings, pumps, and actuators
Standard MS aerospace sealing component
Direct replacement per MS aircraft hardware standards