We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Threaded steel conduit locknut with zinc-plated finish

L.H. DOTTIE

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

SKU CH-F30Q-WP6QA

Threaded steel locknut with zinc plating secures 4-inch conduit fittings

  • TypeCable Management & Conduit
  • 4 in threaded locknut secures large conduit runs
  • Steel construction resists mechanical stress during installation
  • Zinc plating protects against corrosion in damp locations
  • DOTTIE brand ensures consistent thread quality
  • Cable management fitting organises and protects wiring systems

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.

Highlights

  • 4 in threaded locknut secures large conduit runs
  • Steel construction resists mechanical stress during installation
  • Zinc plating protects against corrosion in damp locations
  • DOTTIE brand ensures consistent thread quality
  • Cable management fitting organises and protects wiring systems

Specifications

BrandDOTTIE
TypeCable Management & Conduit

Questions about this item

How can I confirm the 4 in locknut is properly secured after installation?

Tighten the locknut until the conduit fitting sits flush against the enclosure with no visible gap and the threads are fully engaged.

What comes with the LN400 locknut and what must I supply separately?

The package contains the zinc-plated steel locknut only; you must provide the 4 in conduit, fittings and any required tools.

Which version of the LN400 locknut should I select for a 4 in conduit run?

The LN400 is offered in a single 4 in threaded steel zinc-plated version, so choose that model for a 4 in conduit.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.