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TM 10-5430-232-12&P
Table I-1. General Torque Requirements for Dry Fasteners*
Torque Requirement In lb ft (N-m)
Bolt/Screw
AE Grade
SAE Grade
SAE Grade
SAE Grade
Size
1 or 2
5
6 or 7
8
1-1/8-7 UNC
350 (475)
800 (1085)
1000 (1356)
1280 (1736)
1-1/8-12 UNF
400 (542)
880 (1193)
1050 (1424)
1440 (1953)
1-1/4-7 UNC
500 (678)
1080 (1464)
1325 (1797)
1820 (2468)
1-1/4-12 UNF
550 (746)
1125 (1526)
1325 (1797)
1820 (2712)
1-3/8-6 UNC
660 (895)
1460 (1980)
1800 (2441)
2380 (3227)
1-3/8-12 UNF
740 (1003)
1680 (2278)
1960 (2658)
2720 (3688)
1-1/2-6 UNC
870 (1180)
1940 (2631)
2913 (3950)
3160 (4285)
1-1/2-12 UNF
980 (1329)
2200 (2983)
3000 (4068)
3560 (4827)
*Torque given is for clean, dry threads. Reduce by 10% when engine oil is used as lubricant.
Table I-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)
I-2
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