TM 10-4320-346-12&P
Table H-1. General Torque Requirements for Dry Fasteners.* - Continued.
Torque Requirement in lb ft (N.m)
Bolt/ Screw
SAE Grade
SAE Grade
SAE Grade
SAE Grade
Size
1 or 2
5
6 or 7
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 H-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
6.50
(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)
H-2
