Figure 2-87.Correct and incorrect riveting.
A correctly drawn, upset, and headed rivet is
shown in the top part of figure 2-87. The lower part of
this figure shows the results of incorrect riveting.
An addition to sheet-metal rivets are the pop
rivets shown in figure 2-88. These pop rivets are
high-strength, precision-made, hollow rivets
assembled on a solid mandrel that forms an integral
part of the rivet. They are especially useful for blind
fastening-where there is limited or no access to the
reverse side of the work.
Pop rivets provide simplicity and versatility. hey
are simple and easy to use in complicated installations.
Expensive equipment or skilled operators are not
required. Just drill a hole, insert, and set the pop rivet
from the same side, and high riveting quality and
strength are easily and quickly accomplished.
Two basic designs of pop rivets are used: closed
end and open end. The closed-end type fills the need
for blind rivets that seal as they are set. They are
gastight and liquidtight, and like the open-end type,
they are installed and set from the same side. As the
rivet sets, a high degree of radial expansion is
generated in the rivet body, providing effective
The open-end type of pop rivet resembles a hollow
rivet from the outside. Because the mandrel head stays
in the rivet body, the mandrel stem seals to a certain
degree, but it is not liquidtight.
Figure 2-89 shows two of the tools used for setting
the pop rivets. These tools are lightweight and very
easily used. For example, when using the small hand
tool, you need only to insert the mandrel of the rivet
in the nosepiece, squeeze the handle (usually three
times), and the rivet is set. To operate the scissors-type
tool, fully extend the lever linkage or gatelike
mechanism and insert the rivet mandrel into the
nosepiece of the tool. Insert the rivet into the piece
being riveted. Apply firm pressure to the tool,
ensuring that the nosepiece remains in close contact
with the rivet head. Closing the lever linkage retracts
the gripping mechanism, which withdraws the
mandrel. The rivet is set when the mandrel head
Figure 2-88.Pop rivets.
Figure 2-89.Pop rivet toots.