Appleton GL-300-D Malleable Iron Grounding Locknut 1 in

Product Description

The APPLETON GL-300-D is a malleable iron grounding locknut designed for 1-inch conduit installations. This fitting provides a secure mechanical and electrical grounding connection between metal conduit and an enclosure or box. It threads onto the conduit hub and tightens against the knockout edge, maintaining a continuous grounding path through the raceway system. Licensed electricians install this fitting in commercial, industrial, and residential applications where code-compliant equipment grounding continuity is required. The malleable iron construction delivers durability in demanding environments where vibration or mechanical stress may be present.

This grounding locknut is used in standard 1-inch rigid metal conduit (RMC) and intermediate metal conduit (IMC) installations. It is well suited for service entrances, panel terminations, junction box connections, and other locations where a reliable grounding locknut is specified. The fitting is appropriate for both new construction and retrofit wiring projects in commercial and industrial settings.

Key Features

• 1-inch trade size fits standard RMC and IMC conduit threads
• Malleable iron construction resists mechanical stress and vibration
• Grounding-style design maintains electrical continuity through the raceway
• Threaded engagement locks conduit securely to enclosure knockouts
• Suitable for use in commercial, industrial, and residential electrical installations

Compatibility

Designed as an OEM-style replacement or standard-use grounding locknut for 1-inch trade size rigid metal conduit and intermediate metal conduit terminations.

Installation Notes

Installation is performed by a licensed electrician. De-energize the circuit and verify lockout/tagout procedures are in place before working on any enclosure or panel. Thread the locknut onto the conduit end, insert through the knockout, and tighten firmly against the enclosure wall using a locknut wrench or screwdriver and hammer to ensure solid metal-to-metal contact for grounding continuity. Follow applicable NEC requirements for equipment grounding conductor continuity and conduit termination methods.

Technical Specifications

• Trade Size: 1 inch
• Material: Malleable Iron
• UPC: 68785516375

Standard Information

• Brand: APPLETON
• Manufacturer Part Number: GL-300-D