It is easy to use the search system of Fasten.it:

Are you looking for a company manufacturing or selling fasteners, fixing elements, bolts,washers ..?
Select "I look for a company" on the search menu and enter the description (ex "rivets", "washers") in the empty box.

Are you looking for information about a particular product? The comparison among different norms?
Select "I look for a product" on the search menu and enter the description (ex "studs", "clamps") in the empty box or the related norm (ex. "DIN 931", "ISO 4032")

Now you just have to click "search!"