It’s not much of a stretch to say that without nuts and bolts, the world would fall apart ... that not only do lock washers add very little security to bolted connections, none of the other ...
The SR-71 Mach 3 spy plane is built of titanium, with titanium nuts and bolts. The sockets also have to be made from titanium, because the nickel in standard sockets corrodes the titanium bolts.
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