TM10-5430-229-13&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 mini-
mum 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)
H-2
