NissanDiesel Forums

Posted: **Wed May 15, 2024 9:15 am**

I am tired of re-locating this info, so I'm plunking it here.

Fastener Design Manual - NASA Technical Reports Server (NTRS):
https://ntrs.nasa.gov/citations/19900009424
leads to:
https://ntrs.nasa.gov/api/citations/199 ... 009424.pdf

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On pages 8/9:

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Posted: **Wed Mar 11, 2026 7:28 pm**

So they're useless? Since 1990? But they're still ubiquitous! What's everybody supposed to use now?

Posted: **Sun Mar 15, 2026 12:51 pm**

There are lots of lockwashers that work. Toothed, serrated face, locknuts (mechanical (taper thread, deformed thread) & nylock), jam nuts ("double nut").

See "Locking Methods" beginning on pg. 6 of the PDF linked above.

NissanDiesel Forums

Split lock washers are useless (says NASA, 1990)

Split lock washers are useless (says NASA, 1990)

Re: Split lock washers are useless (says NASA, 1990)

Re: Split lock washers are useless (says NASA, 1990)