If you have ever wondered what project calls for a flat washer and which needs a beveled washer, here's the answer to your questions.
A flat washer is used primarily to fill in space or to protect a surface you're attaching the bolt to (i.e. a wood headboard). However, a beveled (or locking) washer makes sure that your nut doesn't come loose. In fact, some even dig a groove into the surface to keep it from turning. There would be times you would use both: beveled
to keep the nut tight; flat to fill in space.
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