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TM 10-4320-347-13&P
Table G-1. General Torque Requirements for Dry Fasteners. - Continued.
Torque requirement in lb ft (N.m)
Bolt/Screw
Size
SAE Grade
1 or2
SAE Grade
5
SAE Grade
6or7
SAE Grade
8
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)
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)
G-2
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