2-12. Pop Rivet Replacement
Nominal
Hole size
Grip
Rivet
Diameter
Length
rivet
and drill
a. Storage and Handling. Rivets must be stored in
range
No.
diameter
number
the original labeled packages. The packages shall be
.419
.251-.312
45
kept closed when not in use to prevent dirt, grit,
#30
.125
46
.481
.313-.375
metal chips, etc., from coming in contact with the
48
.628
.376-.500
lubricated stems.
.254
.020-.125
52
b. Removal. Rivets which are damaged or used for
.126-.187
.316
.160-.164
securing a replaceable part shall be removed as
54
.379
.188-.250
5/32
#20
.156
follows.
.504
.251-.375
56
(1) Drill through the center of the rivet. Use a
.629
.376-.500
drill bit with the same diameter as the original rivet
.020-.125
.277
62
hole. The drill must be held perpendicular to the
.126-.250
64
.402
.192-.196
66
.251-.375
.527
3/16
#11
.187
surface to prevent enlargement or damage to the
.652
68
.376-.500
existing hole. Drill through just deep enough to
.777
610
.501-.625
sever the rivet head from the shank.
.902
.626-.750
(2) Remove any remaining rivet with a pin punch
.125-.250
.447
84
.257-.261
and remove any burrs from rivet hole.
.572
.251-.375
86
1/4
F
.250
c. Rivet Replacement. Select a rivet of the proper
.697
88
.376-.500
diameter and length and install as follows.
.947
.626-.750
812
Note. Proper length of rivet to be used shall be determined by
(1) The rivet stem and collar shall be flush with-
measuring the actual thickness of material through which the
in the limits described in figure 2-2.
rivet will go and then selecting proper grip length per table 2-3.
(2) A slight "flash" caused by the pressure neces-
Proper rivet diameter is important as blind rivets installed in
oversize holes will not retain the stem satisfactorily. Undersize
sary to drive the rivet is acceptable within the limits
holes will not permit proper pull-in of stems. (fig. 2-3).
shown in figure 2-2.
(1) Hold parts to be riveted tightly together with
(3) The configurations of installed rivets with the
epoxy or other satisfactory method.
blind side visible shall be similar to those shown in
(2) Insert proper rivet in hole and apply with gun
(supplied with repair kit) by inserting stem head of
(4) Superficial stretch marks which may appear
rivet in bottom slot in gun pulling head (nose piece).
on the rivet are not detrimental to rivet strength and
Note. Wet all rivets with sealant (PRC 611, Products Re-
are acceptable.
search Co., Burbank, California, or equivalent) before installa-
(5) After stem trimming, stem can be checked
tion.
for tightness by applying a force of approximately
(3) Hold gun at right angle to work. Push gun
ten pounds to the trimmed stem of the rivet, push
against work with just enough force to firmly seat
steadily; do not strike. If the stem is neither pushed
rivet and to aid in avoiding sheet or other part sepa-
out or loose, tightness is satisfactory.
ration.
(6) Rivet head gapping shall be checked with a
(4) Pull rivet until stem breaks.
0.002 feeler gage. Rivets with a 0.002 gap on more
(5) Installed blind rivets shall be checked per
than 40 percent of the rivet head circumference
paragraph 1-12d, before proceeding.
shall not be acceptable.
(6) Trim the broken stem flush with the rivet
(7) A partial gap on a round surface is accept-
head.
able, provided the rivet head bears at tangent points,
(7) Firmly press on the installed rivet to assure
as shown in figure 2-2.
tightness.
d. Inspection of Installed Rivets. Installed rivets
shall be inspected as follows.
a. Removal. Inserts which are damaged or missing
Table 2-3. Blind Rivet Selection Chart
shall be removed as follows.
(1) Using a drill with the same size as the initial
Diameter
Length
Grip
Hole size
Nominal
Rivet
potting hole, drill out the insert.
range
and drill
rivet
No.
number
diameter
(2) Remove loose particles from the hole using a
compressed air blast with clean air.
b. Potting Resin (adhesive) Mixing. The adhesive
compound shall be blended using a 50% resin and 50%
0.096-.100
.212
3/32
.020-.125
32
curing agent ratio. Blend the resin and the curing
.094
#41
.337
.126-.250
34
.170
41
.020-.062
agent together in a paper mixing cup using long,
42
.232
.063-.125
smooth strokes, rather than a whipping motion. Pot
.294
.126-.187
43
life after mixing is 10 minutes and the adhesive shall
1/8
.128-.132
.357
44
.188-.250
be discarded after 8 minutes.
