When vapor and liquid tight fastening is required, use a closed end rivet (its blind end is solid and remains closed even after setting). Most blind rivets are open end, which means that the rivet body is completely hollow. Stainless Steel Rivet & Stainless Steel Mandrelīlind rivets are popular because they install quickly and easily they produce strong reliable fastenings (if the mandrel breaks off, the rivet is installed correctly) they are vibration and tamper resistant and the rivets and installation tool do not mar the surfaces of the material being joined.At a predetermined point, the exposed mandrel will break off inside the rivet.īlind rivets are available in different head styles like dome, large flange, and countersunk, and in different combinations of materials, which affects strength and corrosion resistance… Installation of blind rivets is easy: (1) insert the rivet into a hole that passes through the items to be joined (2) insert the mandrel into the special installation tool (3) "set" the rivet by pulling on the mandrel, which creates a bulge that permanently and securely fastens the items. Blind rivets are also known as "pop" rivets because POP® is one brand of blind rivets.Ī blind rivet consists of two pieces that are pre-assembled: the rivet body (usually just referred to as the rivet) and inside it is the setting mandrel (commonly just called the mandrel). Repairs to more than two adjacent oversize rivets, or replacing more than half the rivets with oversize rivets in any 10 inch length of pattern is prohibited.Fastener Tech Data | Understanding Series IntroductionĪ blind rivet is a rivet that can be completely installed from one side, unlike machine screws and nuts, which requires access to both sides of the material. Repair limitations: The combined oversize rivet hole repairs and oversize countersink repairs should be limited to a maximum of 20 percent of the rivets, or 10 rivets in a single rivet pattern, whichever is less. The term "next larger size" shall be defined as the next larger diameter for the application, but not to exceed 1/32 inch increments for sizes up to 1/4 inch diameter and 1/16 inch increments for sizes above 1/4 inch. Oversize countersinks: When countersinks are enlarged beyond specified tolerances, the next larger size rivet may be used, provided pitch and edge margin design requirements are maintained. Burrs may be removed from rivet holes by chamfering to a depth not to exceed 10 percent of the stock thickness, or 0.032 inch, whichever is less. Mating surfaces should be cleaned before parts are riveted together, all chips, burrs and foreign material must be removed from the mating surfaces. If piercing is used, all holes need be inspected for radial cracking. Piercing Only piercing tools which produce-true and clean holes, equivalent to acceptable drilled holes should be used. When drilling through more than one sheet, hold the sheets securely together so there is no misalignment of holes due to shifting or separation of the sheets. Extreme pressure shall not be applied and holes shall not be punched through with the drill.Ĭ. All holes shall be drilled normal (at 90 degrees) to the working surface.ī. Drilling Rivet holes should be drilled in accordance with the following recommendationsĪ.
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