Hummer H1 Service Manual page 633

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10-6 Body
Hole Countersinking
NOTE: Some rivet installations in the body require the rivet to
be flush with the rivet material surface. In these instances,
countersunk or flush-head rivets are used.
1. When using countersunk rivets, rivet holes must be coun-
tersunk with a tool having a 100 degree taper, so rivet head
will fit flush with surface.
2. When using a hand-operated countersinker, the hole must
be tried with a rivet so the recess will not be too deep or
too shallow. It is best to use a countersinker with a stop on
it so depth of the countersink can be controlled. Typical
countersinking dimensions for blind rivets are shown in
Table 4. The minimum sheet thickness that can be
machined for 100 degree countersunk rivets is given in
Table 5.
3. Do not remove edge of hole on blind side of joint.
table 4: Countersinking Dimensions for 100 Degree Countersunk Blind Rivets
Rivet Diameter
0.1250 in. (3.18 mm)
0.1563 in. (3.97 mm)
0.1875 in. (4.76 mm)
Table 5: Minimum Sheet Gauge for 100 Degree Machine Countersunk Rivets
0.0938 in.
Rivet Size
(2.38 mm)
0.040 in.
Gauge
(1.02 mm)
Countersinking Dimensions (100 Degree)
Minimum
0.222 in. (5.64 mm)
0.283 in. (7.19 mm)
0.350 in. (8.89 mm)
0.1250 in.
(3.18 mm)
0.050 in.
(1.27 mm)
Blind Rivet Driving Practices and Precautions
1. Rivets should be inspected for proper installation. The grip
length of each rivet is marked on top of its head to provide
positive identification. Use of proper grip length will pro-
duce a rivet installation where locking collar is flush with
top surface of rivet head. Tolerance limit on flushness is
0.020 in. (0.51 mm).
2. For proper rivet installation, it is imperative that holes be
properly prepared, tools be in good working order, and
rivets properly installed. When problems occur, the source
of trouble could be in any of these areas.
0.1563 in. 0.1875 in.
(3.97 mm) (4.76 mm)
0.064 in. 0.072 in.
(1.63 mm) (1.83 mm)
Maximum
0.228 in. (5.79 mm)
0.289 in. (7.34 mm)
0.356 in. (9.0 mm)
0.2500 in.
(6.35 mm)
0.072 in.
(1.83 mm)
®