A rivet is a permanent mechanical fastener. Before it is installed it consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or pre-drilled hole. Then the tail is "upset" (i.e. deformed) so that it expands to about 1.5 times the original shaft diameter and holds the rivet in place. To distinguish between the two ends of the rivet, the original head is called the factory head and the deformed end is called the shop head or buck-tail. Tungsten rivet reaction blocks are widely used in rivet gun.
Because there is effectively a head on each end of an installed tungsten rivet reaction blocks it can support tension loads (loads parallel to the axis of the shaft); however, it is much more capable of supporting shear loads (loads perpendicular to the axis of the shaft). Bolts and screws are better suited for tension applications.
Fastenings used in traditional wooden boat building like copper nails and clinch bolts work on the principle of the rivet but tungsten rivet reaction blocks were in use long before the term rivet was invented and, where they are remembered, are usually classified among the nails and bolts respectively.
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