What type of bolt head is the most common?

The hex head bolt is the most common type of bolt head used in various applications. Its design features six flat sides, which allows for a secure grip with standard wrenches and sockets, facilitating easy and effective tightening or loosening. This versatility makes the hex head a preferred choice in many mechanical and construction contexts, as it provides better torque application compared to other shapes.

Furthermore, the hex head design is conducive to high-strength applications and is compatible with automated fastening tools, enhancing efficiency in assembly processes. The widespread use of hex head bolts across different industries solidifies their status as the most commonly encountered type of bolt head. Other bolt head types, such as round, flat, and square heads, have specific applications but do not match the overall prevalence and functionality of hex heads in everyday use.