Middle Atlantic STL BOX Connector 3/4 In. - 5781A

Middle Atlantic 5781A Steel Box Connector 3/4 In.

Overview

The Middle Atlantic 5781A is a 3/4-inch (19.1 mm) galvanized steel box connector designed for use with Middle Atlantic's 500 and 700 series 12-inch raceway and cord cover systems. When you're terminating raceway runs into junction boxes or outlet boxes, this fitting provides a clean, code-compliant transition point — keeping cable management continuous from the raceway into the box without improvised field solutions. TAA compliance makes the 5781A suitable for federal installations, government facilities, and any procurement governed by the Trade Agreements Act.

Compatibility

The 5781A is engineered for Middle Atlantic's Middle Atlantic raceway and cord cover line, specifically the 500 series and 700 series 12-inch steel raceway systems. It fits standard 3/4-inch knockouts on electrical junction boxes and device boxes — the industry-standard knockout size found on the vast majority of commercial electrical enclosures. If your raceway run terminates at a surface-mount box, in-wall box, or pull box with a 3/4-inch knockout, this connector closes that interface cleanly. It is not interchangeable with fittings sized for 1/2-inch or 1-inch knockouts, so confirm your box knockout diameter before ordering. For broader cable management planning in structured cabling or security infrastructure deployments, verify knockout sizing across all termination points before specifying quantities.

Installation Notes

Installation follows standard conduit fitting practice: insert the connector through the 3/4-inch knockout and secure with the included locknut (verify locknut is supplied — confirm package contents at time of order). The galvanized steel construction is suited to indoor commercial environments. No specialized tooling beyond standard electrician hand tools is required. TAA-compliant sourcing means this fitting can be specified directly on government or federally funded projects without additional procurement review for country-of-origin compliance.