![]() The ability to set blind rivets without the need for access at the back of the workpiece makes their use mandatory in many instances.īlind rivets are commonly associated with the aircraft industry. Unlike many other fasteners that require access to both sides, a blind rivet can be set from one side of the work. The blind head is the rivet body portion on the blind side after the rivet has been set. At a predetermined setting force or tensile load, the mandrel breaks and falls away. Pulling on the mandrel with a rivet tool deforms the tail end of the rivet body, forming a blind-side head. As the tool begins to pull the mandrel head into the rivet body, the body expands and forms a joint. Next, the jaws or nosepiece of a manual or automated rivet tool grips the mandrel. The rivet body is inserted in a hole in the parts to be joined. It looks like a nail or wire, and is pulled through the joint of a blind rivet hole during setting. The mandrel is the mating section of the rivet body, also known as the stem, which protrudes from the rivet core. However, the extent of the core depends on the rivet style. A hole, or core, usually extends the length of the body. The diameter of the rivet body determines the rivet size. The tube portion is called the shank and the flared portion is called the head. The body, or sleeve, looks like a small tube that is flared on one end. Photo courtesy Emhart Fastening Teknologies How They Work A blind rivet is a two-piece fastener that consists of a headed, hollow rivet body and a solid mandrel. More fixed, semiautomatic workstations are being used to feed and insert blind rivets. Since rivets were often inaccessible from both sides of the work, this assembly process was extremely slow and very time consuming. Before blind rivets were widely accepted, installation of solid aluminum rivets in fuselages, wings and other airframe components typically required two assemblers: one person with a rivet hammer on one side of the structure and a second person with a bucking bar on the other side. Blind rivets also trace their roots to the aircraft industry. The blind rivet was originally developed as a replacement fastener for solid rivets where service repair was required. Because blind rivets are installed from only one side of the component, they are cost-efficient and versatile. The back, or blind side, is mechanically expanded to form a bulb or upset head. Unlike solid rivets, blind rivets can be inserted and fully installed in a joint from only one side of a part or structure, "blind" to the opposite side. Rivet nuts are an ideal replacement for weld nuts because they will not distort base materials, eliminate weld splatter, toxic fumes, and other by-products of the welding process, and can be installed in many different kinds of material including steel, plastic, composites, and fiberglass.Blind rivets are permanently installed fasteners that sometimes exceed the performance criteria for comparable solid rivets. In the field of aviation, rivet nuts are often used to attach various items, such as static dischargers and inspection access covers, to the surface of an aircraft. It was first used to mount rubber de-icing boots to aircraft wings. The first rivet nut was created by BF Goodrich in the 1930s, and sold under the trademark RIVNUT®. The other is similarly drawn in using a screw, but is drawn into the sleeve instead of creating a bulge. There are two types: one is designed to form a bulge on the back side of the panel as a screw is tightened in its threads. Sectional view, with bolt inserted.Ī rivet nut, also known as a blind rivet nut, or rivnut, is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. Kind of threaded insert Typical rivet nut Sectional view.
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