or self-plugging because of the self-heading feature.
Figure 5-14 shows a general type of blind rivet.
The rivnut is a hollow aluminum rivet that is
counterbored and threaded on the inside. The rivet is
installed with the aid of a special tool. Rivnuts are used
primarily as a nut plate. They may be used as rivets in
secondary structures such as instruments, brackets, and
soundproofing materials. After rivnuts are installed,
accessories can be fastened in place with screws.
Rivnuts are manufactured in two head styles,
countersunk and flat, and in two shank designs, open
and closed ends. See figure 5-15.
Open-end rivnuts are the most widely used. They
are preferred in place of the closed-end type. However,
in sealed flotation or pressurized compartments, the
closed-end rivnut must be used.
Further information concerning rivets may be
found in Aviation Structural Mechanic (H&S) 3 & 2,
What are the two major types of rivets used in
streamlining is important?
miscellaneous fastener used to fasten special
Some fasteners cannot be classified as rivets,
turnlocks, or threaded fasteners. Included in this
category are snap rings, turnbuckles, taper pins, flat
head pins, and flexible connector/clamps.
A snap ring is a ring of metal, either round or flat in
cross section, that is tempered to have springlike action.
This springlike action holds the snap ring firmly seated
in a groove. The external types are designed to fit in a
groove around the outside of a shaft or cylinder. The
internal types fit in a groove inside a cylinder. A special
type of pliers is made to install each type of snap ring.
Snap rings may be reused as long as they retain their
shape and springlike action.
A turnbuckle is a mechanical screw device
consisting of two threaded terminals and a threaded
barrel. Figure 5-16 shows a typical turnbuckle
Figure 5-14.Self-plugging rivet (mechanical lock).
Figure 5-15.Sectional view of rivnut showing head and end
L (THREDS FLUSH WITH ENDS OF BARREL)
Figure 5-16.Typical turnbuckle assembly.