L.H. DOTTIE LNS300 conduit fitting locknut 3 in threaded steel zinc plated

3-inch threaded steel locknut

The DOTTIE LNS300 is a zinc-plated steel locknut designed for 3-inch conduit fittings. It secures threaded conduit connections in electrical installations where a durable, corrosion-resistant fastener is required. The locknut threads onto standard conduit hubs or fittings to lock them firmly in place. Suitable for commercial and industrial wiring projects that use rigid or intermediate metal conduit.

Zinc-plated steel threads resist corrosion

The zinc plating protects the steel threads from rust in damp or outdoor environments, extending the service life of the conduit assembly. The locknut relies on standard NPT threading dimensions for 3-inch trade size, so it fits compatible hubs and fittings without adapters. Installation requires only a wrench to tighten against the fitting shoulder; no specialised tools are needed. The plain steel construction conducts electricity, so the assembly maintains grounding continuity when properly tightened.

Replaces worn or missing locknuts on 3-inch conduit

Use this locknut when an original fastener is damaged, lost during maintenance, or when assembling new conduit runs that require 3-inch trade-size fittings. The jump is worth it whenever a secure, code-compliant mechanical connection must be restored quickly. It does not suit smaller conduit sizes, non-threaded coupling systems, or applications that demand insulated or non-metallic hardware. Buyers needing metric threads or plastic locknuts should select a different product.