Southwire LNS350I Sealing Locknut Steel 3.5 Inches

Product Description

The SOUTHWIRE LNS350I is a 3.5-inch steel sealing locknut designed to secure conduit fittings and provide a weathertight seal at enclosure knockouts. This type of locknut is a standard component in electrical conduit installations, creating a firm, sealed connection between conduit and junction boxes, panels, or other enclosures. Licensed electricians and conduit installers rely on steel sealing locknuts to meet code requirements where moisture ingress at entry points must be controlled. The steel construction provides the mechanical strength and thread integrity needed in both indoor and outdoor applications.

The LNS350I is suited for trade and commercial electrical installations where a 3.5-inch conduit entry point requires a secure, sealed termination. Typical use cases include service entrances, wet locations, industrial panels, and any conduit run terminating into a metal enclosure where a standard locknut alone is not sufficient to prevent moisture entry. This part is installed by licensed electricians working on conduit systems that require a positive seal at the knockout.

Key Features

• Steel construction for durable, high-strength thread engagement at conduit knockouts
• 3.5-inch trade size fits standard 3.5-inch conduit knockouts
• Sealing design controls moisture ingress at enclosure entry points
• One year limited warranty from SOUTHWIRE
• Manufactured in Indonesia

Compatibility

Designed as an OEM-style replacement or standard-use sealing locknut for 3.5-inch conduit terminations at metal electrical enclosures, junction boxes, and panel knockouts.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize all circuits and lock out the panel before working at any enclosure entry point. Thread the locknut onto the conduit fitting and tighten securely against the inside wall of the enclosure to achieve the required seal. Do not overtighten to the point of damaging the knockout edge or sealing element.

Technical Specifications

• Trade Size: 3.5 inches
• Material: Steel
• Weight: 0.24 pounds
• Warranty: One Year Limited
• Country of Origin: Indonesia

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: LNS350I