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the claim
Lock washers prevent bolts from loosening.
the verdict
CONTESTED PARTIAL
Recorded sources
5 sources for · 3 against
Is it true that Lock washers prevent bolts from loosening?
Partly. Reference and regulatory sources describe lock washers as a means intended to prevent bolts and nuts from loosening under vibration, but a finite-element study reports spring washers can show negative loosening resistance, and other sources call their reliability conditional or unclear. The evidence covers the intent and partial effectiveness rather than a general guarantee.
Verdict: CONTESTED PARTIAL · 5 sources for, 3 against · Last checked
Evidence for · 5
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What are washers for?. (n.d.). physics.stackexchange.com. https://physics.stackexchange.com/questions/134705
Evidence against · 3
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LOCK WASHERS. (Ellesmere Guardian, 22 January 1929). (1929). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/EG19290122.2.5.1
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More for · 4
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46 CFR 160.115-7 - Design, construction, and performance of winches.. (2024). ecfr.gov. https://www.ecfr.gov/current/title-46/section-160.115-7
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46 CFR 160.170-7 - Design, construction, and performance of automatic release mechanisms.. (2016). ecfr.gov. https://www.ecfr.gov/current/title-46/section-160.170-7
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Wikipedia: Jam nut. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Jam_nut
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encyclopedia-of-science-and-technology-mc-graw-hill. (n.d.). archive.org. https://archive.org/details/encyclopedia-of-science-and-technology-mc-graw-hill
More against · 2
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Loosening Resistance Evaluation of Double-Nut Tightening Method, Spring Washers, and Conical Spring Washers: Finite Element Study. (n.d.). cir.nii.ac.jp. https://doi.org/10.1115/pvp2008-61345
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ばね座金を用いたボルト締結部の設計指針の検討. (n.d.). cir.nii.ac.jp. https://doi.org/10.1299/jsmedsd.2018.28.1405
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held for human review17 Oct 2026
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