Hex dome nuts or acorn nuts got their names due to the dome-shaped projection on one side of the nut. This is mostly used to protect objects close to the ends of screws from scratches and structural injuries. It also reduces the effects of physical mishaps on human skin if it somehow forcefully hits the fasteners. The external threads of the screws inserted into these nuts are securely enclosed within the dome. In addition to the protection it offers, these nuts provide the structure an aesthetically pleasing look.