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TM 10-5430-242-12&P
0043 00
0043 00-2
Table 2. Locknut Breakaway Torque Values.
NOTE
To determine breakaway torque, thread locknut onto screw or bolt until at least two
threads stick out. Locknut shall not make contact with a mating part. Stop the locknut.
Torque necessary to begin turning locknut again is the breakaway torque. Do not reuse locknuts
that do not meet minimum breakaway torque.
Thread
Minimum Breakaway Torque
Size
lb-in.
(N·m)
10-32
2.0
(0.23)
1/4-28
3.5
(0.40)
5/16-24
6.5
(0.73)
3/8-24
9.5
(1.07)
7/16-20
14.0
(1.58)
1/2-20
18.0
(2.03)
9/16-18
24.0
(2.71)
5/8-18
32.0
(3.62)
3/4-16
50.0
(5.65)
7/8-14
70.0
(7.91)
1-12
90.0
(10.17)
1-1/8-12
117.0
(13.22)
END OF WORK PACKAGE
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