TM 10-5411-205-13
3-9.
General Repair Procedures (cont).
(a) Determine thread size, grip range, style, and material of rivnut to be used.
Grip length equals combined thickness of materials being fastened togeth-
er. Grip range of rivnuts must encompass grip length.
WARNING
Drilling creates metal chips which may enter eyes and cause seri-
ous injury. Eye protection is required.
CAUTION
Do not drill deeper than necessary to install rivet as you may drill
through other side of panel.
NOTE
Drill hole size must match size of rivnut being installed. Quan-
tities of sheets may be drilled at the same time when
with sheet fasteners.
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
Drill hole in structure.
Remove all metal chips and remove burrs from
If a countersunk head rivnut is being installed,
100-degree machine countersink.
held ‘together
drilled holes.
countersink hole using a
Thread stem of appropriate pullup stud into rivnut. Stud should protrude
through open end rivnuts, or be 1-1/2 threads from bottoming in closed
end rivnuts.
Coat rivnut body with sealer before installing.
Insert rivnut in hole. Make sure sheets are held
pulling.
tightly together before
With pullup stud parallel to axis of rivnut, pull up on rivnut. Exert firm
pressure but do not bend or buckle metal sheets.
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.
3-18
