Thomas Betts 143SL Conduit Locknut 1 in Rigid Imc Steel

Product Description

The THOMAS BETTS 143SL is a steel, non-insulated conduit locknut designed to secure rigid metal conduit (RMC) and intermediate metal conduit (IMC) fittings to enclosures, panels, and junction boxes. At a 1-inch trade size with a threaded connection, this locknut seats against the knockout edge and locks the conduit fitting in place to maintain a solid mechanical and electrical bond. Licensed electricians and electrical contractors install this hardware during new construction and retrofit work. Its watertight area-of-application rating makes it suitable for installations where moisture resistance is a priority.

This locknut is intended for use with 1-inch trade size rigid metal conduit and IMC systems in both commercial and residential electrical installations. It is commonly installed where conduit enters metallic enclosures, load centers, pull boxes, and similar equipment. The threaded design allows for quick, tool-assisted tightening to ensure a secure, low-resistance connection at the conduit termination point.

Key Features

• 1-inch trade size fits standard rigid and IMC conduit fittings
• Steel construction provides durability in demanding electrical environments
• Threaded connection for secure mechanical attachment to enclosure knockouts
• Non-insulated design for straightforward metallic bonding applications
• Rated for watertight area-of-application use

Compatibility

Designed as an OEM-style replacement and standard-fit locknut for 1-inch trade size rigid metal conduit and intermediate metal conduit (IMC) fittings with threaded connections.

Installation Notes

Installation is typically performed by a licensed electrician in accordance with applicable NEC requirements. De-energize all circuits and verify the panel or enclosure is powered down before beginning conduit termination work. Thread the locknut onto the conduit fitting, insert through the enclosure knockout, and tighten securely using a locknut wrench or large flathead screwdriver to ensure proper mechanical and electrical continuity. Do not overtighten in a way that deforms the knockout edge or compromises the fitting seal.