![]() Pull mandrel or pull-up rivets have a hollow core rivet body and an integral mandrel. Blind rivets are commonly classified as either pull-type or drive-pin-type fasteners. Material choices include aluminum, steel, stainless steel, copper, brass and plastic. Multiple Choicesīlind rivets are available in a wide variety of materials, diameters, grip ranges and head styles. These rivets expand like the petals of a flower on the back side of the material, so the clamping force is spread out.īlind fasteners come in many shapes and sizes, including N-, Q- and T-type rivets (top to bottom). Increased use of composite materials, such as plastic, fiberglass and plywood, has increased demand for blind rivets with different upset styles to fasten those materials. Electronics manufacturers are also using more blind rivets for box-build applications. Bus, truck, railcar and recreational vehicle assemblers are heavy users of blind rivets. However, they are also used in a wide variety of products, such as air bag assemblies, telecommunication equipment cabinets, stoves, air conditioners, garage doors, prefabricated metal buildings and mail boxes. 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. Blind rivets are permanently installed fasteners that sometimes exceed the performance criteria for comparable solid rivets.
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