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TM 10-3930-643-34
APPENDIX E (cont)
d.
Table E-4.
Torque Limits for Tube Nuts.
This table provides tightening
torques for tube nuts when tubes are flared to use 37 degree fittings.
Torque
limits given are for plain, cadmium,
or zinc plated fittings for wet or
dry
installations.
FITTING NO.
THREAD SIZE
4
5
6
8
10
12
14
16
20
24
32
7/16-20
1/2 -20
9/16-18
3/4 -16
7/8 -14
1-1/16-12
1-3/16-12
1-5/16-12
1-5/8 -12
1-7/8 -12
2-1/2 -12
TORQUE
IN FOOT
POUNDS
9
12
21
35
53
77
90
110
140
162
225
12
15
24
40
58
82
100
120
150
175
240
TORQUE
IN NEWTON
METERS
MIN.
12
16
29
47
72
104
122
149
190
217
305
MAX.
16
20
33
54
79
111
136
163
204
237
325
e. Table E-5.
Torque Limits for Hydraulic Fittings. This table provides
tightening torques for preformed packing, boss connectors and plugs, 37 degree
seat swivel nuts (fittings and hose), and locknuts on adjustable fittings.
FITTING NO.
4
5
6
8
10
12
14
16
20
24
32
TORQUE
IN FOOT
THREAD SIZE
MIN.
MAX.
7/16-20
1/2 -20
9/16-18
3/4 -16
7/8 -14
1-1/16-12
1-3/16-12
1-5/16-12
1-5/8 -12
1-7/8 -12
2-1/2 -12
6
10
15
25
35
60
70
80
95
120
250
10
15
20
30
40
70
80
90
115
140
300
TORQUE
IN NEWTON
METERS
MIN.
8
14
20
34
48
81
95
109
129
163
339
MAX.
14
20
27
41
54
95
109
122
156
190
407
E-3/(E-4 blank)
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