TM 9-4520-260-13
Table G- 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
1-1/8-7 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() (118())
1940 (2631)
2913 (3950)
3160 (4285)
1-1/2-12 UNF
980 (1329)
22(00) (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 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
Iocknuts 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
