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 MIL-HDBK-419A
Table 1-23
Minimum Torque Requirements for Bolted Bonds
Bolt Size
Min. Torque
Tension
Threads/Inch
Bond Area
(in -1bs)
(in.2)
(lbs)
32
18
625
0.416
#8
36
20
685
0.456
#10
24
23
705
0.470
32
32
940
0.626
1/4"
20
80
1840
1.225
28
100
2200
1.470
5/16"
18
140
2540
1.690
20
150
2620
1.750
16
250
3740
3/8"
2.430
24
275
3950
2.640
7/16"
14
400
5110
3.400
20
425
5120
3.420
1/2"
13
550
6110
4.070
20
6140
575
4.090
5/8"
11
920
7350
4.900
3/4"
10
1400
9300
6.200
7/8"
9
1950
11100
7.400
1"
8
2580
12900
8.600
f.
Once the mating surfaces have been cleaned of all nonconductive material, join the bond members
together as soon as possible. If delays beyond two hours are necessary in corrosive environments, the cleaned
surfaces must be protected -with an appropriate coating which, of course, must be removed before completing
the bond.
Alligator clips and other spring loaded clamps are to be employed only as temporary bonds. Use
g.
them primarily to insure that personnel are not inadvertently exposed to hazardous voltages when performing
repair work on equipment or on facility wiring.
1-141
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