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Distributor's Link Magazine Spring 2021 / Vol 44 No 2


54 THE DISTRIBUTOR’S LINK GOEBEL FASTENERS INC. 5650 Guhn Rd Suite 110, Houston, Texas 77040 TEL 713-393-7007 FAX 713-393-7084 EMAIL WEB UNDERSTANDING THE VARIATIONS AND BENEFITS OF RIVET NUTS Rivnuts were originally developed in the late 1930s by the BF Goodrich Company and sold under the trademark RIVNUT®. They are also known as blind rivet nuts or threaded inserts. The makeup of a rivnut is one piece that is threaded internally which is able to be anchored entirely on one side. The rivnuts were first used to mount de-icing boots to aircraft wings. Rivnuts are now available in many variations and sizes and therefore used for many different fastening capabilities. But they are also still important components for aviation. A main strength of rivet nuts are that, just like with traditional rivets, they are blind. Meaning, these fasteners can be installed securely from one side of the work piece. No need to struggle to reach around the back of the bolt to fasten the material with a nut. Once the rivet nut is installed, fasten your material through the rivet nut with any compatible externally threaded fastener and you’re all set. The rivet nut itself can be installed into a variety of a different materials including metal, plastic, fiberglass and carbon fiber. Rivet nuts offer a number of advantages that make them suitable for various applications where other blind rivets won’t do. We’ve already mentioned aviation manufacturing, but rivet nuts can also be used for appliances, automotive manufacturing, office furniture, playground equipment, solar installations, electronics, boats, pools and hot tubs, military equipment, and even bicycles. Rivet nuts are more versatile than self-tapping screws or pressed inserts. They can be made from steel, stainless steel, brass, and other materials, and are not affected by heat, which makes them more convenient for applications such as plastic or wood where conventional welding is impractical. Body styles vary for rivet nuts, with round body rivet nuts being most common. These are found in either plain or serrated style. Serrated bodies are ideal for smaller sized rivet nuts in thin sheet materials where the serrations help to grip more firmly in softer materials such as aluminum. However, when set correctly plain bodied rivet nuts offer no degradation in performance over serrated bodied rivet nuts. TECHNICAL ARTICLE CONTINUED ON PAGE 55

THE DISTRIBUTOR’S LINK 55 GOEBEL FASTENERS UNDERSTANDING THE VARIATIONS & BENEFITS OF RIVET NUTS from page 54 To perform the measurement, the pins are pressed flat against the face of the gage using a surface plate or any other hard flat surface and the indicator is zeroed. The fastener’s hex feature is then aligned with the pins and is pressed up against the gaging diameter. The resultant value shown on the indicator is the wrenching height. Suppliers of external hex drive fasteners must carefully read the specifications for the parts they supply and use the correct gaging method to evaluate wrenching height. Wrenching height is not an insignificant, or an optional inspection characteristic. As stated earlier, wrenching height is vital to achieving correct and consistent fastener tightness in the final assembly. GOEBEL FASTENERS


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