I regularly cruise around eng-tips to see if anything piques my interest. Today I came across this thread from ’08 regarding the efficacy of lock washers. The thread is worth reading in it’s entirety, but there here are a few highlights: From NASA fastener design manual, page 9 (bold mine): The [helical] lock washer (like the one [...]
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fasteners
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When forced to users fasteners in plastic I generally try to incorporate thread inserts into the design, but if that’s not feasible you have two choices: thread-forming screws (left) or thread-cutting screws (right). (Be-careful, people mix up the two all the time) thread-forming screws When screwed into a pre-drilled hole (spec sheets will tell you [...]
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fasteners,
thread-cutting,
thread-forming
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