That O-ring seals against the flat, machined face in the corresponding female fitting. O-Ring Boss (ORB) fittings are the “standard” hydraulic fittings we grew up with, where a threaded male ...

It has been 40 years since NASA launched the first dedicated Department of Defense Space Shuttle mission, after which engineers spotted O-ring seal defficiencies that would doom Challenger a year ...

On that cold January morning, the O-rings failed to properly seal, allowing hot gases to escape and eventually leading to the explosion. This event shocked NASA and forced the space agency to re ...