4 in. steel locknut, zinc-plated, for use with Rigid/IMC conduit. This 4-inch locknut is manufactured by Steel City (ABB) and finished with a zinc electroplate to resist corrosion in typical electrical installations. It is UL-listed to E23018 and sized for 4-inch trade-size Rigid or IMC conduit, providing a secure, durable connection in metal conduit systems.
