Yes, you are correct. A Metallic Insulated Grounding Bushing (MIGB) is designed to screw onto the threaded end of an EMT connector.Here's a breakdown of why and how: Purpose of MIGB

To provide a smooth, insulated surface where conductors exit the conduit or connector. This protects the wire insulation from abrasion, preventing shorts or ground faults. It also provides a grounding path.

Threaded Connection

EMT connectors often have threaded ends specifically for accepting accessories like MIGBs.

Installation: You simply screw the MIGB onto the threads of the EMT connector until it's snug. No special tools are required, though some people might use pliers very* carefully to tighten it a bit more, but over-tightening can damage the bushing.So, your understanding is accurate. A MIGB attaches to an EMT connector by screwing onto the threaded portion. Flag for review