3-1/2" Steel Grounding Locknuts – Electrical Distributor Locking and Grounding Solutions

The 3-1/2" Steel Grounding Locknuts by Southwire are engineered for secure locking and grounding in electrical installations involving threaded conduit. Designed for use with externally threaded conduit connectors to threadless box or enclosure openings, these locknuts provide reliable mechanical and grounding connections. Ideal for electrical distributors and switchgear suppliers, they support lighting solutions and wire and cable management systems requiring robust, UL-listed components.

Specifications

• Material of Construction: Steel
• Size: 3-1/2"
• Thread Pitch: 8 threads per inch
• Height: 0.19 inches
• Weight: 0.2040 lbs
• Finish: Zinc plated
• Manufacturer: Southwire
• Manufacturer Part Number: 559
• UL Listed: Yes, UL Standard 514B
• Applicable Standards: UL 514B, Fed. Spec W-F-406E/W-F-406D, NEMA FB 1-2014
• UPC: 751338153301

Features

• Heavy gauge steel construction ensures durability and performance integrity
• Serrated teeth design provides enhanced bite into the box to prevent loosening
• Tightens without deformation for secure and stable connections
• UL listed for safety and compliance in electrical installations
• Compatible with threaded conduit connectors and threadless box openings
• Ready availability in multiple sizes for flexible electrical distributor inventory

Downloads and Links

• Topaz Rigid - IMC Fittings Catalog (PDF)
• Topaz Official Website