TM 9-4310-394-13
Table G-1. General Torque Requirements for Dry Fasteners. - Continued.
Torque Requirement in lb ft (N.m)
Bolt/Screw Size
SAE Grade1 or 2
SAE Grade5
SAE Grade6 or 7
SAE Grade8
1-8 UNC
235 (319)
590 (800)
660 (895)
910 (1234)
1-14 UNF
250 (339)
660 (895)
825 (1119)
990 (1342)
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 G-2. Locknut Breakaway Torque Values.
NOTE
To determine breakaway torque, thread lock nut 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.
Minimum Breakaway Torque
Thread Size
lb-in.
(N.m)
10-32
2.0
(0.23)
¼-28
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)
½ -20
18.0
(2.03)
9/16-18
24.0
(2.71)
5/8-18
32.0
(3.62)
¾-16
50.0
(5.65)
7/8-14
70.0
(7.97)
1-12
90.0
(10.17)
1-1/8-12
117.0
(13.22)
G-2
