A fastener Cap Nut Acorn Nut, also known as an acorn nut or crown nut, is a type of nut with a domed cap on one end and a threaded hole on the other end. It is commonly used in a variety of applications where a secure and aesthetic finish is desired.

One of the primary uses of fastener cap nuts is to cover the exposed end of a bolt or screw, providing a smooth, rounded surface that is less likely to snag or catch on clothing or other objects. The cap nut can also help to prevent corrosion and damage to the threaded end of the bolt or screw.

Cap nuts are commonly used in a variety of applications, including:

1. Automotive: Cap nuts are used in the wheels and axles of cars, trucks, and other vehicles.

2. Furniture: Cap nuts are used in the assembly of furniture, particularly for covering exposed bolts and screws.

3. Construction: Cap nuts are used in construction to secure metal beams and other structural elements.

4. Electrical: Cap nuts are used in electrical applications to secure wires and other components.

5. Plumbing: Cap nuts are used in plumbing applications to secure pipes and fittings.

6. Marine: Cap nuts are used in marine applications to secure rigging, anchors, and other equipment.