This is a standard 5.5 mm x 2.1 mm female DC supply connector, and it is often referred to as a Barrel DC connector. It is a low-voltage DC input power connector. In power delivery applications, it can be mounted on an appliance or a PCB and connected to a 2.1mm male power connector which supplies power from a power supply.
Dimensions = Barrel Fit: 5.5 mm OD × 2.1 mm ID (standard) Inline Connector Length: ~30–35 mm Panel-Mount Threaded Neck: ~7–9 mm diameter, 5–8 mm long
Additional resources
Package Includes
1 x Female DC Power Supply Connector / Barrel DC Jack