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A blind rivet is a permanent mechanical fastener. Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the tail. On installation, the rivet is placed in a punched or drilled hole, and the tail is upset or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place. In other words, pounding creates a new “head” on the other end by smashing the “tail” material flatter, resulting in a rivet that is roughly a dumbbell shape. 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.
Because there is effectively a head on each end of an installed rivet, 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.

There are several common types of blind rivets each with its own advantages. The most common are:
Standard
These rivets are the most common blind rivets and the least expensive. However, they do not watertight and are not as strong as some other rivet types.
Sealed
These rivets are similar to standard rivets except that the mandrel is completely enclosed. The result is that when installed sealed rivets are watertight.
Multi-grip
These rivets are specifically designed for situations where you don’t know how long a rivet you might need (the grip). They are more expensive than standard rivets, but when a long length is used on thin material they compact, leaving less material hanging off the back.
Interlock
Interlock rivets are the most common type of ‘structural’ or high strength rivet. They are specifically designed to provide superior pull out and shear strength. This additional strength is achieved by using a specially designed mandrel (orange) that is pulled into the rivet (green), creating a double-thick wall.

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