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What is the name for a protrusion of material that's built to be flexible in order to act as a latching mechanism? These show up in all kinds of products, but one of the most recognizable is in a snap-fit buckle (below). Is there a name for this component?

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"Snap-fit" uses the same idea generally for any assembled part using elastic regime of the material. https://en.wikipedia.org/wiki/Snap-fit

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