Southwire SB8757 Nylon Knockout Bushing 1/2 Inch

Product Description

The SOUTHWIRE SB8757 is a nylon knockout bushing designed to protect wire and cable insulation from abrasion at conduit entry points. It seats into a standard 1/2 inch knockout opening in electrical enclosures, panels, and junction boxes, creating a smooth, non-metallic edge that prevents damage to conductor insulation during pull-through and long-term service. Licensed electricians and electrical contractors install this bushing during panel wiring, device box rough-in, and enclosure termination work where code-compliant edge protection is required.

This bushing is suited for residential and light commercial electrical installations where conductors pass through knockout openings in steel enclosures, load centers, and outlet boxes. It is a standard trade consumable stocked by electricians for everyday panel and box work. The nylon construction resists moisture and corrosion, making it appropriate for damp or indoor service environments.

Key Features

• Nylon construction resists corrosion and protects conductor insulation from sharp metal edges
• Fits standard 1/2 inch knockout openings in electrical enclosures and junction boxes
• Smooth interior profile reduces abrasion risk during wire pull-through
• Lightweight and easy to seat by hand without special tooling

Compatibility

Designed as an OEM-style replacement bushing for standard 1/2 inch knockout openings in residential and commercial electrical enclosures and junction boxes.

Installation Notes

Installation is performed by a licensed electrician following NEC requirements for conductor protection at enclosure entry points. De-energize the panel or enclosure completely before seating or removing bushings. The bushing is typically pressed into the knockout opening by hand or with light thumb pressure before conductors are pulled through. Inspect the bushing seat to confirm it is fully engaged and flush before closing the enclosure.

Technical Specifications

• Knockout Size: 1/2 inch
• Material: Nylon
• Weight: 4 pounds
• UPC: 75133832630

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: SB8757