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From the NASA "Fastener Design Manual". Lockwashers The typical helical spring washers hown in figure14 is made of slightly trapezoidal wire formed into a helix of one coil so that the free height is approximately twice the thickness of the washer cross section. They are usually made of hardened carbon steel, but they are also available in aluminum, silicon, bronze, phosphor-bronze, stainless steel, andK-Monel. The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the bolt is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a Iockwasher of this type is useless for locking.

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From the NASA "Fastener Design Manual". Lockwashers The typical helical spring washers hown in figure14 is made of slightly trapezoidal wire formed into a helix of one coil so that the free height is approximately twice the thickness of the washer cross section. They are usually made of hardened carbon steel, but they are also available in aluminum, silicon, bronze, phosphor-bronze, stainless steel, andK-Monel. The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the bolt is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a Iockwasher of this type is useless for locking.
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rag. Gustavino Bevilacqua (gustavinobevilacqua@mastodon.cisti.org)'s status on Friday, 10-Jan-2025 04:13:59 JST rag. Gustavino Bevilacqua

Lockwashers of the split type are USELESS!
Not my opinion: NASA told that in their March 1990 "Fastener Design Manual", and who am I to contradict NASA?
PDF here: https://ntrs.nasa.gov/api/citations/19900009424/downloads/19900009424.pdf
#mechanics #workshop

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