It is estimated that about more than 500,000 fasteners have been defined by standards. Certainly hundreds of different specifications, recommendations, etc. are available today.

In general, standards cover such things as fastener materials, mechanical and physical properties, strengths, configurations, dimensions, usage, definitions, finishes, test procedures, grade markings, and manufacturing procedures. This does not mean that every standard covers each of these things—just that standards exist for all of these topics and for others.

There are some standards below including characteristics and specifications of fasteners.