Square Head Carriage Bolt Screw

Good Quality Motorcycle Tensile Strength 12.9 Grade Carbon Steel Zinc Plated Carriage Screw

1. Construction: Carriage bolts are usually made of steel, stainless steel, or other alloy materials. They consist of three main parts: a round, domed head with a smooth, slightly curved top surface; a threaded shank that extends from the head; and a square or rectangular shoulder section located directly below the head.

2. Head Design: The domed head of a carriage bolt is typically larger in diameter than the threaded shank. It provides a smooth, finished appearance and offers a bearing surface when installed. The top surface of the head is usually flat or slightly rounded, making it suitable for applications where a flush or low-profile finish is desired.

3. Square Neck: One distinctive feature of a carriage bolt is the square or rectangular neck section just below the head. The square neck is designed to fit into a corresponding square hole or slot in the material being fastened, preventing the bolt from rotating during installation. This feature allows for easy one-person installation, as the bolt can be held in place while the nut is tightened on the threaded end.

4. Threaded Shank: The threaded shank of a carriage bolt extends from the head and is used to secure the bolt in place. The threads on the shank are typically coarse, allowing for quick and easy installation into pre-drilled or pre-tapped holes.

5. Applications: Carriage bolts are commonly used in woodworking, construction, and other applications where a secure joint is needed. They are frequently used to fasten wood components, such as building structures, fences, decks, and furniture. Carriage bolts can also be used in metal-to-metal applications, such as securing brackets or plates.

6. Installation: To install a carriage bolt, a hole is first drilled into the material being fastened. The square neck of the bolt is then inserted into the corresponding square hole or slot. The bolt is held in place while a wrench or socket is used to tighten a nut onto the threaded end of the bolt, securing the joint.