A locknut that crossthreads on the first turn damages the fitting — now you are replacing the whole assembly. 2-inch steel locknut for rigid and IMC conduit. Extruded steel body with zinc plating — more consistent thickness than stamped versions, crossthreading is less likely. O-ring gasket groove seals against moisture in wet locations. Electricians running 2-inch conduit in industrial, agricultural, or wet-location work across northeast Nebraska and northwest Iowa keep extras in the truck — the ones that actually fit save callbacks. In stock at Crofton Lumber (Crofton, NE) and Akron Lumber (Akron, IA). Stocked at Crofton Lumber and Akron Lumber.