411 REFERENCE · Wiktionary
Jesus nut
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Possibly from the Vietnam War. From the notion that, given its critical function, if the nut were to fail, the only thing left to do would be to "pray to Jesus".
Noun
en aviation slang The nut that holds the main rotor to the mast of some helicopters.
en slang metaphorical A single point of failure with catastrophic consequences.
See also
en Jesus clip Jesus freak Jesus pin
en eponyms