TM 5-6675-348-13&P
(3)
To Find the sealing surface angle, use a
protractor and measure the sealing
surface parallel to the centerline of the
fitting.
Table J-3. Torque Limits for Dry Fasteners
Size
SAE Grade
SAE Grade
SAE Grade
SAE Grade
No. 2
No. 5
No. 6 or 7
No. 8
Threads
mm
lb-ft
Nm
lb-ft
Nm
lb-ft
Nm
lb-ft
Nm
Dia. In.
per In.
1/4
20
6.35
5
7
8
11
10
14
12
16
1/4
28
6.35
6
8
10
14
12
16
14
19
5/16
18
7.94
11
15
17
23
21
28
25
34
5/16
24
7.94
12
16
19
26
24
33
25
34
3/8
16
9.53
20
27
30
41
40
54
45
61
3/8
24
9.53
23
31
35
47
45
61
50
68
7/16
14
11.11
30
41
50
68
60
81
70
95
7/16
20
11.11
35
47
55
75
70
95
80
108
1/2
13
12.70
50
68
75
102
95
129
110
149
1/2
20
12.70
55
75
90
122
100
136
120
163
9/16
12
14.29
65
88
110
149
135
183
150
203
9/16
18
14.29
75
102
120
163
150
203
170
231
5/8
11
15.88
90
122
150
203
190
258
220
298
5/8
18
15.88
100
136
180
244
210
285
240
325
3/4
10
19.05
160
217
260
353
320
434
380
515
3/4
16
19.05
180
244
300
407
360
488
420
570
7/8
9
22.23
140
190
400
542
520
705
600
814
7/8
14
22.23
155
210
440
597
580
786
660
895
1
8
25.40
220
298
580
786
800
1085
900
1220
1
12
25.40
240
325
640
868
860
1166
1000
1356
