Southwire LNS350 Sealing Locknut Steel 3-1/2 Inches 5 Pack

Product Description

The SOUTHWIRE LNS350 is a 3-1/2 inch rigid sealing locknut designed to secure threaded conduit or conduit connectors to electrical junction boxes and enclosures in wet or damp locations. Constructed from steel with a zinc electroplated finish, this locknut features a gasketed seating surface that creates a watertight seal against the box wall when properly torqued. The design allows standard junction boxes with unthreaded knockout openings to be used in wet location installations without requiring specialized enclosures. Sold in a 5-pack, these locknuts are a practical stocking item for commercial and residential electrical rough-in work.

These sealing locknuts are suited for use wherever threaded rigid metal conduit or IMC enters a junction box, pull box, or enclosure exposed to moisture, rain, or washdown conditions. Typical applications include outdoor electrical installations, wet industrial environments, and any conduit entry point where a standard locknut would not provide an adequate moisture barrier. The gasketed design eliminates the need for additional sealants at the conduit-to-box connection.

Key Features

• 3-1/2 inch trade size fits standard threaded rigid conduit and conduit connectors
• Integrated gasket creates a watertight seal at the box surface for wet location use
• Zinc electroplated steel construction provides corrosion resistance in damp environments
• Allows standard junction boxes to serve wet location installations at unthreaded knockouts
• Sold as a 5-pack for efficient stocking and multi-point installations

Compatibility

Designed as an OEM-style sealing locknut for use with 3-1/2 inch threaded rigid metal conduit and IMC conduit connectors at standard knockout openings in electrical junction boxes and enclosures rated for wet or damp locations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements for wet location conduit entries. De-energize all circuits in the affected enclosure before beginning work. Thread the locknut onto the conduit or connector and tighten firmly against the box wall to compress the gasket and achieve a proper watertight seal. Do not overtighten to the point of gasket deformation, as this can compromise the seal.

Technical Specifications

• Trade Size: 3-1/2 inches
• Material: Steel, Zinc Electroplated
• Seal Type: Gasketed, Watertight
• Location Rating: Wet and Damp Locations
• Quantity: 5 per pack
• Weight: 0.18 pounds
• Warranty: One Year Limited
• Country of Origin: United States

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: LNS350