3
. BOLT TORQUE
CHECKING BOLT TORQUE
The tables shown below give correct torque values for various bolts and capscrews. Tighten all bolts to
the torques specified in chart unless otherwise noted. Check tightness of bolts periodically, using bolt
torque chart as a guide. Replace hardware with the same strength bolt.
ENGLISH TORQUE SPECIFICATIONS
METRIC TORQUE SPECIFICATIONS
SAE
(N.m) (lb-ft)
Bolt Torque*
Bolt
Diameter
"A"
SAE
(N.m) (lb-ft)
SAE 8
(N.m) (lb-ft)
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
8
13
27
41
61
95
128
225
230
345
6
10
20
30
45
60
95
165
170
225
12
25
45
72
110
155
215
390
570
850
9
19
33
53
80
115
160
290
420
630
17
36
63
100
155
220
305
540
880
1320
12
27
45
75
115
165
220
400
650
970
8.8
(N.m) (lb-ft)
Bolt Torque*
Bolt
Diameter
"A"
0.9
(N.m) (lb-ft)
M3
M4
M5
M6
M8
M10
M12
M14
M16
M20
M24
M30
M36
.5
3
6
10
25
50
90
140
225
435
750
1495
2600
.4
2.2
4
7
18
37
66
103
166
321
553
1103
1917
1.8
4.5
9
15
35
70
125
200
310
610
1050
2100
3675
1.3
3.3
7
11
26
52
92
148
229
450
774
1550
2710
Torque figures indicated above are valid for non-greased or non-oiled threads and heads unless oth
-
erwise 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 value for bolts and capscrews are identified by their head markings.
