Table 2. Locknut Breakaway Torque Values

TM 10-5430-238-12&P

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Table 2. Locknut Breakaway Torque Values

NOTE

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

threads stick out. The 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 requirements.

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

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