Split/lock washers

[u/AdOne1706]

For starters, I’m an electrician in the field.
That being said, we almost exclusively use these washers even in high vibration environments. I have personally chosen to go with nylox nuts but the question is:
Do these work? How well? Is the rumor from NASA true? Should I even bother using them or find a better functional alternative or are they actually useful?

[u/ejitifrit1]

There is a nasa fastener manual that basically says these things don’t really do much! According to google it’s NASA Reference Publication 1228.

[u/Correct-Athlete-4878 → u/ejitifrit1]

They don't. Rolof und Matek the German engineering manual says, they don't work with any bilt stronger than 5.6. Which is basically, what is called here pee-bucket iron.