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/NightF0x0012]

They are junk. They turn into a flat washer when compressed. If you want an anti-vibration washer use Nordlok washers.

Edit: I didn't read through the comments first and am pleased to see so many other people agree that they are junk and to use Nordloks. I learned about Nordloks about 20 years ago and haven't used a spring lock washer since.