What is the most common shape for bolt heads?

The most common shape for bolt heads is hexagonal. This design provides several benefits that contribute to its popularity in various applications. A hexagonal head allows for a larger surface area for grips when using a wrench or socket, making it easier to apply the necessary torque during installation or removal. Additionally, the shape helps reduce the likelihood of rounding off the corners when properly used with compatible tools.

Hexagonal heads also facilitate the use of standard fastener sizes and tooling, making them versatile and widely accepted in the industry. This standardization simplifies the process of selecting and using fasteners for different projects, whether in manufacturing, construction, or automotive applications. The accessibility and efficiency of using a hexagon shape in various settings reinforce its position as the most common shape for bolt heads.