TM 9-6115-664-13&P
Table H-1. Torque Limits for Dry Fasteners (continued)
TORQUE
SIZE
SAE GRADE 6
SAE GRADE 7
SAE GRADE 8
Diameter in
Threads Per
Millimeters
Foot
Newton
Foot
Newton
Foot
Newton
Inches
Inch
Pounds
Meters
Pounds
Meters
Pounds
Meters
1/4
20
6.350
13
17
13
18
14
19
1/4
28
6.350
14
18
14
19
15
21
5/16
18
7.937
24
33
25
34
29
39
5/16
24
7.937
26
35
27
37
32
43
3/8
16
9.525
43
58
44
60
47
64
3/8
24
9.525
47
64
48
65
51
69
7/16
14
11.112
69
94
71
96
78
106
7/16
20
11.112
75
102
77
105
85
115
1/2
13
12.700
106
144
110
149
119
161
1/2
20
12.700
116
157
120
163
130
176
9/16
12
14.287
150
203
154
209
169
229
9/16
18
14.287
164
222
168
228
184
250
5/8
11
15.875
209
283
215
291
230
312
5/8
28
15.875
228
309
234
318
251
340
3/4
10
19.050
350
475
360
488
380
515
3/4
26
19.050
382
517
392
532
414
562
7/8
9
22.225
550
746
570
773
600
813
7/8
24
22.225
600
813
621
842
654
887
1
8
25.400
825
1119
840
1139
900
1220
1
14
25 400
899
1219
916
1241
981
1330
Table H-2. Effect of Lubrication on Torque
TORQUE RATING IN FOOT-POUNDS
Lubricant
5/16-18 Thread/Inch
1/2-13 Thread/Inch
NO LUBE. Steel
29
121
Plated and cleaned
19 (66%)
90 (26%)
SAE 20 Oil
18 (38%)
87 (28%)
SAE 40 Oil
17 (41%)
83 (31%)
Plated and SAE 30
16 (45%)
79 (35%)
White Grease
16 (45%)
79 (35%)
White Moly Film
14 (52%)
66 (45%)
Graphite and Oil
13 (55%)
62 (49%)
Use the above lubrication percentages to calculate the approximate decrease in torque rating for other bolt sizes.
H-2
