What is the primary function of a flat washer?

• A. To prevent loosening of a fastener
• B. To distribute the load of a bolted connection over a wider area
• C. To provide a surface for hand tightening
• D. To cut into concrete surfaces

Answer: (B)

A flat washer primarily serves the function of distributing the load of a bolted connection over a wider area. When a bolt or nut is tightened, it exerts a significant force on the material being fastened. Without a washer, this force could create a localized stress point that might damage the surface or material. By using a flat washer, the load is spread out, which helps to prevent damage, reduces the risk of loosening due to vibration, and improves the overall stability of the connection.

Additionally, while preventing loosening of a fastener is important, that role is typically more directly addressed by other methods such as lock washers or thread locking components. A flat washer does not provide a specific surface for hand tightening, nor does it have any function related to cutting into concrete surfaces, distinguishing its primary function clearly as load distribution.