A hex bolt, also known as a hex head bolt or hexagonal bolt, is a type of fastener commonly used in construction and machinery. However, there are several other synonyms for this versatile bolt. One of them is a hexagonal screw, which shares the same six-sided shape. Another synonym is a cap screw, referring to the fact that it is usually fastened with a matching hexagonal cap or nut. Additionally, it can be called a machine bolt due to its common utilization in machinery assembly. Ultimately, regardless of the synonym used, these bolts offer secure and reliable fastening solutions in various industries.