Table 2. Locknut Breakaway Torque Values

TM 10-5430-239-12&P

0043 00

Table 2. Locknut Breakaway Torque Values

NOTE

To determine the breakaway torque, thread the locknut onto screw or bolt until at least two

threads are shown. The locknut shall not make contact with a mating part. Stop the locknut.

The 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.

(Nm)

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

0043 00-2