1/4" X 1-3/8" Stud Channel Nut - Electro-Galvanized is a nut with a threaded stud that features a spring that fits 1-5/8" strut channel. Stud Nuts for Strut Channel fasten channel and fittings together and work specifically with Solid Strut Channel with no holes or slots. Electro-Galvanized Steel should be used in interior applications where conditions are dry, and humidity is low.