I have a tendency to keep all the extra screws, nuts, and bolts that come with electronics, toys, furniture, etc just in case we have a malfunction in the middle of the night and ohmigosh this thingamajig just fell apart because it’s missing ONE screw but Home Depot isn’t open! So as you can probably imagine, our toolbox carries a giant mess of various fasteners in all shapes and sizes.

I could never really tell the difference between each nut or bolt, or even what they’re called.

Enter Bolt Depot’s interactive guide to fasteners.

Not only does it describe the different nuts, bolts, washers, etc, it also tells you what each should be used for and offers a downloadable PDF for offline viewing.

For instance, did you know that there exists a category of bolts called sex bolts? And that they function exactly how you would think they would (minus the naughty bits)? Well, now you do!

Go download your PDF now. I, for one, immediately saved it in my computer for those just in case moments.

Via Lifehacker.