![]() I do not recommend BRs for use in fuel wet areas. I am also concerned regarding installation procedures and am careful to specify sealing for corrosion protection. and/or increasing the numbers of blind-rivets in proportion to the yield strength differences. This usually requires increasing diameter of the Blind rivet. In general I use blind rivets to substitute for driven rivets ONLY when I can prove the BR YIELD STRENGTH is equal to, or higher than, the solid rivet yield strength. NOTE: oversizes are absolutely required when installing in oversized/elongated holes.ģ. If designed into the joint properly, and if quality parts are used, then "blinds" can perform beautifully. Also, since these fasteners do not fit as tightly into the holes they are much more difficult seal and may loosen and leak after repeted/vibration loading. In general vibration performance of blind fasteners is inferior to equivalent driven fasteners due to their low yield strengths. There is usually a wide difference between the ultimate and yield strength of most BRs due to the poor hole filling and "multi-piece" design. ![]() but most of the common types do not have shanks that swell. Certail specialized blind fasteners have shanks that swell to fill holes. usually the pin-core forms a bulb on the end of the sleeve on the opposite side of the assy. ![]() They are installed by various mechanisms. HOWEVER they are much more expensive to manufacure and install, IE: they are made from multiple precision pieces, and have to be installed in precision holes using specialized tools. The primary benefit of blind fasteners is easy one-sided assembly. Blind rivets and bolts also come in a wide variety of alloys, similar to driven rivets. Note: driven rivets can be successfully installed in slightly oversized/elongated holes!!!Ģ. or can be esily made so by installing them "wet" with very thin sealant or epoxy primer. Since they typically "fill" a hole tightly, most driven rivets are fluid tight and very corrosion resistant. In general the hole/countersink-filling properties, produce a very durable fastener installation with yield strength relatively close to ultimate strength. They are installed by a "forging-like" operation that swells the shank and "squashes" the tails. They are far more economical to install due to looser hole tolerances and installation equipment. ![]() Driven rivets come in a variety of alloys. I love "blinds" but have learned respect for their limitations. Be VERY carefull when working with rivets. ![]()
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