What is the typical shape of a bolt head on a hex bolt?

The typical shape of a bolt head on a hex bolt is a six-sided shape. This design allows for easy gripping and turning using standard tools like wrenches and sockets. The six sides provide multiple angles for tool engagement, minimizing the risk of stripping the head when tightening or loosening the bolt. Hexagonal shapes are commonly used in various applications due to their ability to distribute force evenly and their compatibility with a wide range of fasteners and tools.

The other shapes mentioned, such as square, octagonal, and round, do not offer the same level of versatility or strength as a hex shape, making the six-sided design the standard choice for hex bolts.