How is a European hinge typically fastened to a door?

A European hinge is typically fastened to a door using a cup hole, which is a specific type of recess drilled into the door to accommodate the hinge's cup. This design allows the hinge to sit flush with the surface of the door, providing a clean and streamlined look when the door is closed. The cup hole ensures that the hinge is securely fitted and aligned, which is critical for the proper functioning of the door in terms of stability and movement.

In contrast, screws, nails, and adhesives are not the primary fastening methods for European hinges. While screws are generally used to secure hinges in various applications, the defining feature of European hinges is the cup hole that facilitates their installation and operation. Without the cup hole, the unique design and advantages of the European hinge would not be realized effectively.