Cross bar screw. Hex head screw with Washer. Suspension Strut Tower Bolt.
A threaded rod with a drive head (such as Hex, 12 point, torx, etc.) on one end used to secure the Suspension Strut Tower to it's mounting point.
Suspension Strut Tower Bolt
Fits 228i Gran Coupe, 228i xDrive Gran Coupe, M235i xDrive Gran Coupe