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TM 10-4320-348-14
APPENDIX H
TORQUE LIMITS
NOTE
To determine breakaway torque, thread nut onto screw or bolt until at least two threads stick out.
Nut shall not make contact with a mating part. Stop the nut. Torque necessary to begin turning
nut again is the breakaway torque. Do not reuse self-locking nuts that do not meet minimum
breakaway torque.
Usage
Much Used
Much Used
Used at Times
Used at Times
To 1/2-69,000
To 3/4-120,000
To 5/8-140,000
150,000
Capscrew diameter and
(4850.7000)
(8436.0000)
(9842.0000)
(10545.0000)
minimum tensile strength
To 3/4-64,000
To 1-115,000
To 3/4-133,000
psi (kg/cm2)
(4499.2000)
(8084.5000)
(9349.9000)
To 1-55,000
(3866.5000)
Minimum
Medium Best
Quality of Material
Indeterminate
Commercial
Commercial
Commercial
SAE Grade Number
1 or 2
5
6 or 7
8
Capscrew Body Size
Torque
Torque
Torque
Torque
inches (thread)
ft-lb
(m-kg)
ft-lb
(m-kg)
ft-lb
(m-kg)
ft-lb
(m-kg)
1/4-20
5
(0.6915)
8
(1.1064)
10
(1.3830)
12
(1.6596)
-28
6
(0.8293)
10
(1.3830)
14
(1.9362)
5/16-18
11
(1.5213)
17
(2.3511)
19
(2.6277)
24
(3.3192)
-24
13
(1.7979)
19
(2.6277)
27
(3.7341)
3/8-16
18
(2.4894)
31
(4.2873)
34
(4.7022)
44
(6.0852)
-24
20
(2.7660)
35
(4.8405)
49
(6.7767)
7/16-14
28
(3.8132)
49
(6.7767)
55
(7.6065)
70
(9.6810)
-20
30
(4.1490)
55
(7.6065)
78
(10.7874)
1/2-13
39
(5.3937)
75
(10.3725)
85
(11.7566)
105
(14.5215)
-20
41
(5.6703)
85
(11.7555)
120
(16.5960)
H-1
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