What is not a function of sheet metal fasteners?

In the context of sheet metal fasteners, the primary functions are related to their role in joining and securing components together to form assemblies. Fasteners are engineered to create structural integrity by ensuring that the parts they connect are held together securely under various loads and conditions. They also enable adjustability in an assembly, allowing for modifications or repairs without the need for complete disassembly or rework of the entire structure.

When considering aesthetic appeal, while it can be an important aspect in some applications, it is not a primary function of fasteners. Fasteners are primarily chosen based on their strength and suitability for a specific application rather than how visually appealing they are. Thus, enhancing the aesthetic appeal is not a primary function of sheet metal fasteners, making it the correct choice in this context.