What is the difference between a coach bolt and a carriage bolt?

The terms **coach bolt** and **carriage bolt** are often used interchangeably, but they technically refer to the same type of bolt. Both refer to a type of bolt with a **rounded head** and a **square neck** beneath the head, designed for use in **wood** or **metal** fastening. However, there can be some slight variations in how they are perceived or used in different regions or industries.

 Key Features (Common to Both):

- **Rounded, domed head**: Both coach and carriage bolts have a smooth, rounded head that sits flush with the surface when fully installed.

- **Square neck**: Directly beneath the head, there is a square section that fits into the material (often wood) to prevent the bolt from rotating while tightening the nut.

- **Threaded shaft**: The shaft of the bolt is threaded for a nut to be attached on the opposite side of the material being fastened.

 Differences (Primarily Regional or Contextual):

1. **Coach Bolt**:

  - The term "coach bolt" is more commonly used in the **UK** and refers to this type of bolt primarily used in **timber** construction.

  - It is often associated with **woodworking** and traditional carpentry tasks like joining wooden structures (e.g., coachbuilding, fences).

2. **Carriage Bolt**:

  - The term "carriage bolt" is more prevalent in the **US** and refers to the same bolt, especially when used in **metal** or **heavy-duty wood applications** like steel structures, furniture assembly, or carriage construction.

  - "Carriage bolts" are sometimes used for securing metal-to-metal or metal-to-wood connections, beyond just woodworking.

Summary:

In most cases, **coach bolts and carriage bolts** are essentially the same type of bolt, with minor differences in naming based on region or application. Both are used for securing materials like wood or metal where a strong, secure fastening is required.

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