Cessna 510 Mustang Structural Repair Manual page 76

A63512
Rivet Diameter
(Inches)
1/8
5/32
3/4
1/4
NOTE:
Countersunk dimensions in this figure are given in terms of the maximum diameter, because
this is the most significant dimension. Prevent too deep a countersink which may cause a
knife edge condition in the riveted material. Depth of countersink must not be greater than
70 percent of the sheet thickness.
Minimum countersink diameters are determined by the aerodynamic flushness requirements.
In actual practice, the proper depth of the countersink is determined by driving a test rivet in
a scrap piece of metal. The depth adjustment of the microstop countersink tool is gradually
increased until a countersink depth that gives the required flushness of a driven rivet. Once
the proper countersink adjustment has been established in this manner, the tool can be used
for countersinking on the actual job.
Copyright © Textron Aviation Inc.
Retain printed data for historical reference only. For future maintenance, use only current data.
Figure 2 : Sheet 1 : Maximum Countersink Diameter for Shear Head Rivets
Maximum
Countersink
Diameter "A"
Inches (mm)
0.200 (5.0)
0.250 (6.3)
0.305 (7.7)
0.405 (10.3)
FOR TRAINING PURPOSES ONLY
ISSUE 02 , JAN 2018
100
Degrees
A
Rivet or
Screw Size
Rivets
3/32
1/8
5/32
3/16
1/4
Screws
6−32
8−32
10−32
1/4−28
5/16−24
Model 510 Structural Repair Manual (Rev 2)
51-40-08-0 (Original Issue)
Minimum surface
sheet thickness
for countersink
inches (mm)
0.032 (0.81)
0.040 (1.02)
0.050 (1.27)
0.063 (1.60)
0.071 (1.80)
0.050 (1.27)
0.050 (1.27)
0.063 (1.60)
0.071 (1.80)
0.071 (180)
Print Date: Wed Mar 21 05:12:02 CDT 2018
6252R1047
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