A Dome Nut (also known as a Cap Nut or Acorn Nut) is a type of nut with a rounded, dome-shaped top that covers the exposed end of a bolt or screw. The dome design not only provides a neat and aesthetically pleasing finish but also protects the threads of the fastener from dirt, debris, and moisture, helping to prevent corrosion. ... Dome nuts are often used in applications where appearance is important, such as in automotive, furniture, and decorative installations. They are typically made from materials like stainless steel, brass, or zinc-plated steel, offering strength, durability, and resistance to corrosion.