5/16" Channel Nut w/Regular Spring - Aluminum Is a strut channel nut used with 1-5/8" x 1-5/8" Strut Channel The indented ridges of the channel nut fit directly into the lips of the channel while the spring presses against the channel to keep the nut from sliding when making connections. Use Like Metal Hardware when looking for nuts, washers, and bolts that fit your application. Aluminum doesn’t rust but it does corrode. Aluminum is a reliable choice for outside structures and may be able to last in the elements for a few years.