FAA Sheet Metal Structures Practice Test 2025 – Your All-in-One Guide to Exam Success!

The distinction between a flush rivet and a dimpled rivet primarily lies in how they are set relative to the surface of the material being riveted. A flush rivet is installed so that its head is entirely recessed or flush with the surface of the material. This creates a smooth surface, which is particularly important in applications where aerodynamic efficiency is critical, such as in aircraft skin or wing structures.

On the other hand, a dimpled rivet involves creating a slight indentation or dimple in the sheet metal during installation. This dimple accommodates the head of the rivet, which protrudes slightly above the surface. While this dimple may offer advantages in some structural applications, it does not achieve the same smooth, flush finish as the flush rivet.

The correct answer accurately describes the specific characteristics of flush and dimpled rivets, focusing on their installation outcomes and their impacts on the material's surface.