Such rivets come with rounded (universal) or 100° countersunk heads. Hundreds of thousands of solid rivets are used to assemble the frame of a modern aircraft. A typical application for solid rivets can be found within the structural parts of aircraft. Solid rivets are used in applications where reliability and safety count. The woman on the left operates an air hammer, while the man on the right holds a bucking bar. Riveting team working on the cockpit shell of a C-47 transport at the plant of North American Aviation. There are a number of types of rivets, designed to meet different cost, accessibility, and strength requirements: The rivets themselves were essentially short rods of metal, which metalworkers hammered into a pre-drilled hole on one side and deformed on the other to hold them in place. Archeologists have also uncovered many Bronze Age swords and daggers with rivet holes where the handles would have been. Rivet holes have been found in Egyptian spearheads dating back to the Naqada culture of between 44 B.C. 2.8 Rivet alloys, shear strengths, and driving condition.
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