TM 10-4520-262-12&P 0069 00
0069 00-3/(4 Blank)
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.
Table 3. Locknut Breakaway Torque Values
Thread
Size
Minimum Breakaway Torque
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)
