A countersunk rivet has a head that is pressed into a recess on the material, making it flush with the surface. It is used for aesthetic reasons or to reduce drag. The hole and head of the rivet are shaped like a funnel to hold it better. They are commonly used in performance vehicles.
A countersunk rivet is a type of fastener that has a head even with or below the plane of the connected material. What makes a countersunk rivet different from a standard rivet is the head. In a normal rivet, the head creates a rounded bump on the surface of the material. The head of a countersunk rivet is pressed into a recess on the material, removing the bump. These rivets are typically used for aesthetic reasons or to reduce drag on the workpiece.
Rivets are a type of permanent fastener. They are pressed through two materials and into a solid plate or block. When they hit the block, the piercing end deforms and widens. This creates a permanent seal as the head and the deformed tail of the rivet are both larger than the hole in the material. Once in place, the only way to remove the rivet is to cut it from the workpiece.
There are a variety of different head styles common in rivets. The most common type is a round head. A button head rivet has a head shaped like half of a sphere. When these rivets are in place, the head is clearly visible on the surface of the object. The other common types of rivets, such as pan or flat heads, also adhere to the surface of a connected object.
The head shape of a countersunk rivet makes the top of the rivet flush with the surface of the attached object. This requires a specially formed countersunk hole. Other rivets are different because as long as they are the correct size they will go into any hole. A countersunk hole flares out at the top to allow the head to drop further down. Effectively lowers the connected surface so that the top of the rivet is flush with the material surface.
Both the countersunk rivet and the hole have the same shape. This common shape allows the rivet to sit in the hole but remain flush with the object. In almost all cases, the hole and the head of the rivet are shaped like a funnel. Sloping edges hold the rivet better than straight edges and make it less likely that water or air will be trapped within the connection.
Manufacturers use countersunk rivets to keep the surface of the connected object smooth. After placing the rivet on the surface, it is common to coat the surface with a sealant or varnish, completely hiding the rivet head. This makes the surface more aesthetically pleasing, as it can be totally smooth. It also causes less resistance than if air were to flow over a common rivet head, making these rivet liners common in performance vehicles.
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