L.H. DOTTIE LN400 Conduit Locknut 4 in Threaded Steel Zinc Plated

4-Inch Conduit Locknut for Electrical Installations

The L.H. DOTTIE LN400 is a 4-inch threaded steel locknut with a zinc-plated finish. It is designed to secure rigid or IMC conduit to boxes and enclosures in commercial and industrial electrical systems. Electricians and maintenance crews use it to create a mechanically strong, code-compliant connection point.

Simple Thread-On Installation with Standard Tools

The locknut spins onto the conduit threads by hand and tightens with a standard wrench or channel-lock pliers. The zinc coating reduces galling on steel threads, but over-torquing can strip the softer plating or deform the nut. Ensure the conduit end is clean and free of burrs before starting the threads to avoid cross-threading.

Suited for 4-Inch Rigid or IMC Conduit Runs

This fitting matches 4-inch trade-size conduit and is not compatible with smaller EMT, PVC or flexible conduit types. Projects requiring insulated throats, grounding lugs or non-metallic locknuts should select a different fitting style. Buyers working with metric pipe sizes or thin-wall tubing will need an alternative product.