A cap nut, also known as a dome nut or acorn nut, is a type of nut that is commonly used in various mechanical and structural applications. It is characterized by its distinctive rounded top and a hexagonal or square base, which allows for easy tightening and loosening with a wrench or a screwdriver.

Key Features of a Cap Nut:

1. Design:Cap nuts have a smooth, rounded top that gives them their name. This design not only provides an aesthetically pleasing appearance but also offers protection against accidental contact with sharp edges.

2. Thread Type:They are available in both standard (UNC/UNF) and metric thread sizes, making them versatile for use in a wide range of applications.

3. Material: Cap nuts can be made from various materials, including steel, stainless steel, brass, and plastic. The choice of material depends on the specific requirements of the application, such as resistance to corrosion or strength.

4. Finish:They can be found in different finishes like zinc-plated, chrome-plated, or plain, which affect their resistance to rust and their appearance.

5. Use: Cap nuts are often used in conjunction with threaded rods, bolts, or screws to secure components in place. They are particularly useful in applications where a smooth, finished look is desired, such as in furniture, machinery, and automotive parts.

6. Advantages:The rounded top of a cap nut helps to prevent damage to the surface it contacts, making it suitable for use in applications where the surface finish is important.

7. Installation: Cap nuts are easy to install and remove, requiring only basic hand tools. They can be tightened or loosened by hand or with power tools, depending on the size and the torque required.