Bolts can be roughly divided into several types based on their design and function. Some of the common types of bolts include:

1. Carriage bolts: These bolts have a smooth, rounded head and a square neck beneath the head. They are typically used in applications where a smooth finish is desired, such as in furniture assembly.

2. Hex bolts: Hex bolts have a six-sided head and are designed to be used with a wrench or socket. They are commonly used in construction and automotive applications.

3. Lag bolts: Lag bolts, also known as lag screws, are large, heavy-duty bolts that are used to fasten wood or metal together. They have a threaded shaft and a hex head for easy installation.

4. U-bolts: U-bolts are U-shaped bolts that are used to fasten pipes, tubes, and other cylindrical objects to a surface. They are commonly used in plumbing and construction applications.

5. Eye bolts: Eye bolts have a looped head that is used to attach ropes, cables, or chains. They are often used for lifting and rigging applications.

6. Anchor bolts: Anchor bolts are used to secure objects to a concrete surface. They have an L-shaped or J-shaped hook at one end that is embedded in the concrete for added stability.

7. Toggle bolts: Toggle bolts are used to secure heavy objects to a hollow wall or ceiling. They have a spring-loaded wing that expands behind the wall when the bolt is tightened.

8. Shoulder bolts: Shoulder bolts, also known as shoulder screws, have a cylindrical shoulder beneath the head that acts as a precise spacer or bearing surface. They are commonly used in machinery and automotive applications.

9. Flange bolts: Flange bolts have an integrated washer beneath the head that distributes the load and provides a larger bearing surface. They are commonly used in automotive and industrial applications.

10. Stud bolts: Stud bolts are threaded rods with threads on both ends that are used to fasten two objects together. They are commonly used in construction and manufacturing applications.

Overall, bolts come in a variety of shapes, sizes, and materials to suit different applications and requirements. It is important to choose the right type of bolt for the specific task at ha