What’s a Carriage Bolt?
Like all bolts, carriage bolts are externally threaded fasteners that are secured with a nut. They function as the male insert while the nut acts as the female counterpart. What differentiates carriage bolts from other types is that the head is characterized by a mushroom (truss) shape. Additionally, the section beneath the head takes the form of a square before transitioning into a rounded shank. This feature enables the bolt to lock into a square bracket, which means it can be fastened with a single wrench. At the same time, this results in the bolt only be accessible from one side. Consequently, carriage bolts have become more popular for security applications where the user can only remove the fastener from the inside.