Carriage bolts—also known as or round head square neck bolts —are specialized fasteners designed for wood-to-wood or wood-to-metal connections where a smooth, secure finish is required. They are defined by their domed, tamper-resistant heads and a square shoulder underneath that locks into the material to prevent the bolt from spinning during installation. Key Features & Benefits
: A cost-effective alternative for outdoor construction, providing a thick protective layer against the elements. Installation Tips Bolt Head Markings: What do they mean? | Fasteners 101 buy carriage bolts
: The smooth, rounded head has no external drive (like a slot or hex), making it nearly impossible to grip or unscrew from the outside—ideal for security applications like locks and hinges. Carriage bolts—also known as or round head square