A wellhead component or a profile formed in wellhead equipment in which the casing hanger is located when a casing string has been installed.

The casing hanger provides a means of ensuring that the string is correctly located and generally incorporates a sealing device or system to isolate the casing annulus from upper wellhead components.

It is composed of casing flange, casing cross joint, wellhead valves, tubing hanger, tubing head cross joint and accessories.