Torque Data for Standard Nuts, Bolts, and Capscrews
Tighten all bolts to torques specified in chart unless otherwise noted. Check tightness of bolts periodically,
using bolt chart as guide. Replace hardware with some grade bolt.
Note: Unless otherwise specified, high-strength Grade 5 hex bolts are used throughout assembly of equipment.
Bolt Torque for Standard Bolts
Bolt Size A
lb-ft
(N.m)
lb-ft
(N.m)
lb-ft
(N.m)
1/4"
6
8
9
12
12
16
5/16"
10
13
18
25
25
35
3/8"
20
27
30
40
45
60
7/16"
30
40
50
70
80
110
1/2"
45
60
75
100
115
155
9/16"
70
95
115
155
165
220
5/8"
95
130
150
200
225
300
3/4"
165
225
290
390
400
540
7/8"
170
230
420
570
650
880
1"
225
300
630
850
970
1310
Bolt Torque for Metric Bolts
Bolt Size A
lb-ft
(N.m)
lb-ft
(N.m)
lb-ft
(N.m)
6
9
13
10
14
13
17
7
15
21
18
24
21
29
8
23
31
25
34
31
42
10
45
61
50
68
61
83
12
78
106
88
118
106
144
14
125
169
140
189
170
230
16
194
263
216
293
263
357
18
268
363
..
..
364
493
20
378
513
..
..
515
689
22
516
699
..
..
702
952
24
654
886
..
..
890
1206
Grade or Class value for bolts and capscrews are identified by their head markings.
Grade 2
Grade 5
Grade 8
Class 8.8
Class 9.8
Class 10.9
Torque figures indicated
are valid for non-greased
or non-oiled threads and
heads unless otherwise
specified. Therefore, do
not grease or oil bolts or
capscrews unless
otherwise specified in this
manual. When using
locking elements, increase
torque values by 5%.
Torque figures indicated
are valid for non-greased
or non-oiled threads and
heads unless otherwise
specified. Therefore, do
not grease or oil bolts or
capscrews unless
otherwise specified in this
manual. When using
locking elements, increase
torque values by 5%.
Helicopter Tanks
14
