Nails that are natural (bare) steel and do not have a protective coating. 

Nails that are heat treated which creates a thin film of oxide on the surface that provides some corrosion resistance and is bluish in color.

Nails that are coated with a very thin layer of zinc to produce a shiny surface that provides some corrosion resistance but its primary purpose is as a cosmetic enhancement.

Is a tough, weather resistant coating applied to steel by dipping the steel in a molten zinc-iron bath. This coating gives a high level of corrosion resistance.

Nails that have a thin coating of zinc phosphate on the surface that provides some corrosion resistance but it's primary purpose is to add pull out resistance making it harder for...

High carbon steel nails that have been exposed to high temperatures to first harden the steel (hardening) so it won't wear down and then heated again (tempered) to help toughen...

Proprietary polymer coating on enclosed fasteners that is equivalent in performance to galvanization that meets ASTM A153 Class D. For use on exterior applications and with all...