TM 55-1560-307-13&P
Table F-1. Breakaway Torque
MINIMUM BREAKAWAY TORQUE FOR USED
ALL METALLIC AND NONMETALLIC SELF-LOCKING NUTS
NUT SIZE
MIN BREAKAWAY
TORQUE (IN-LBS)
FINE THREAD
10-32
2.0
1/4-28
3.5
5/16-24
6.5
3/8-24
9.5
7/16-20
14.0
1/2-20
18.0
9/16-18
24.0
5/8-18
32.0
3/4-16
50.0
7/8-14
70.0
1-12
90.0
1 1/8-12
117.0
1 1/4-12
143.0
1 3/8-12
180.0
1 1/2-12
210.0
COARSE THREAD
4-40
NOTE
6-32
NOTE
8-32
NOTE
10-24
NOTE
1/4-20
NOTE
5/16-18
7.5
3/8-16
12.0
7/16-14
16.5
1/2-13
24.0
9/16-12
30.0
5/8-11
40.0
3/4-10
60.0
7/8-9
82.0
1-8
110.0
1 1/8-7
137.0
1 1/4-7
165.0
1 3/8-6
200.0
1 1/2-6
230.0
1 3/4-5
300.0
NOTE:
TEST NUT FOR MINIMUM BREAKAWAY TORQUE BY ATTEMPTING TO INSERT A MATCHING BOLT
BY HAND. REUSE ONLY THOSE NUTS THAT CANNOT BE TIGHTENED DOWN WITH FINGERS
AFTER THE LOCKING ACTION ENGAGES BOLT OR STUD. NUTS THAT DO NOT MEET THE MINIMUM
BREAKAWAY TORQUE SHALL NOT BE USED.
F-2
