TM 10-5411-224-14
(f)
Coat rivnut body with fiber filled polyester resin before installing.
(g)
Insert rivnut in hole. Make sure sheets are held tightly together before pulling.
(h)
With pull-up stud parallel to axis of rivnut, pull up on rivnut. Exert firm pressure but do not bend or
buckle metal sheets.
(i)
Make sure fastened parts are not loose, rivnut does not rotate, and rivnut head is seated tightly
against surface. Make sure rivnut threads are in good condition. If threads are damaged or rivnut is improperly installed,
remove it and install a new one.
(2)
Removal (Figure 5-6).
WARNING
Drilling creates metal chips which may enter eyes and cause serious injury. Eye protection is
required.
(a)
Drill through head of rivnut, using same size drill used to make original hole. Counterbore in rivnut
will act as a drill guide.
(b)
Remove head of rivnut.
CAUTION
Do not puncture opposite face sheet of panel when punching out rivnut shank.
(c)
Punch out shank of rivnut using a pin punch slightly smaller than hole in structure. Punch only
enough to disengage. Move rivnut aside to install new rivnut.
(3)
Repair (Figure 5-7). When excessive torque is applied on screws attached on rivnuts, it may cause a
rivnut to spin (turn). Table 5-4 provides the maximum torque requirement for hardware to prevent rivnut turning. To
correct a spinning rivnut, proceed as follows:
(a)
Drill a .062 (+ .003, - .001) diameter hole by 1.00 inch long on the stem of the spinning rivnut as
shown in figure 5-7.
(b)
Install a headless straight pin.
Figure 5-6. Rivnut Removal
5-12
