TM 10-3510-220-24
Table D-1. General Torque Requirements for Dry Fasteners* (Continued)
Bolt/screw
Torque requirement in lb ft (N.m)
size
SAE grade
SAE grade
SAE grade
SAE grade
1or 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)
1500 (2034)
2000 (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 torque by 10 percent when engine oil is used as
a lubricant.
Table D-2. Locknut Breakaway Torque Values
NOTE
To determine breakaway torque, thread locknut on to 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
size
10-32
1/4-28
5116-24
318-24
7/16-20
1/2-20
9/16-18
5/8-18
3/4-16
7/8-14
1-12
1-1/8-12
1-1/4-12
Minimum breakaway torque
lb-in.
2.0
3.5
6.5
9.5
14.0
18.0
24.0
32.0
50.0
70.0
90.0
117.0
143.0
(N.m.)
(0.23)
(0.40)
(0.73)
(1.07)
(1.58)
(2.03)
(2.71)
(3.62)
(5.65)
(7.91)
(10.17)
(13.22)
(16.16)
D-2
