Allen bolts are also known as socket head bolts or hex socket screws. These bolts feature a hexagonal socket head shape that is designed to be tightened or loosened with the help of an Allen key or a hex key. They are commonly used in the construction industry as they provide a secure and strong connection. Another synonym for the Allen bolt is the cap screw, which is similar in shape and function. They are widely used in machine applications and are designed to offer high resistance to corrosion and wear. Other synonyms may include hexagon screw, socket cap screw, and headless screw. Despite the different names, they all feature a similar design and function.