How many flats does a hex nut have?

Hex nuts typically have six flat surfaces, which is why the correct answer is six. These six flats allow for easy manipulation with a wrench or pliers, providing a solid grip for fastening purposes. The shape and number of flats are crucial for ensuring that enough surface area is available for the tool, which helps in tightening or loosening the nut securely. The design of having six flats is standard for hex nuts, promoting uniformity and compatibility across various applications and hardware systems.