Nsi Industries 258 Steel Compression Connector 3.5 Inches

Product Description

The NSI INDUSTRIES 258 is a 3.5-inch steel compression connector designed for securing and terminating electrical conduit in commercial and residential wiring installations. Built from steel, this compression-style fitting creates a watertight, mechanically secure connection between rigid metal conduit and an enclosure, junction box, or panel knockout. Electricians rely on compression connectors like the 258 for applications where a tight, vibration-resistant seal is required. The 3.5-inch trade size makes it suited for larger conduit runs carrying high-capacity branch circuits or feeder conductors.

The NSI INDUSTRIES 258 is installed at the point where rigid metal conduit enters an enclosure or panel. It is commonly used in commercial construction, industrial facilities, and utility service work where rigid conduit systems are specified. The compression design eliminates the need for locknuts on the conduit entry side, streamlining termination and reducing parts count on the job. This connector is appropriate for use wherever a 3.5-inch rigid metal conduit termination is required per NEC guidelines.

Key Features

• 3.5-inch trade size fits standard rigid metal conduit of the same diameter
• Steel construction provides mechanical strength and durability in demanding environments
• Compression-style design delivers a secure, vibration-resistant conduit termination
• Compatible with standard knockout openings on enclosures, panels, and junction boxes
• Eliminates the need for a separate locknut on the conduit entry side

Compatibility

Designed as an OEM-style replacement and standard-fit compression connector for 3.5-inch rigid metal conduit termination applications in commercial and residential electrical installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the panel or enclosure before beginning conduit termination work. Hand-tighten the compression nut onto the conduit, then use an appropriate conduit wrench to achieve a firm, secure fit without over-tightening the fitting body. Verify the connector is fully seated in the knockout and that the locknut on the enclosure interior is properly tightened to ensure a solid mechanical and electrical bond.

Technical Specifications

• Trade Size: 3.5 inches
• Material: Steel
• Connection Type: Compression
• UPC: 78174700258

Standard Information

• Brand: NSI INDUSTRIES
• Manufacturer Part Number: 258