11.3 Bolt Torque
IMPORTANT! If you replace hardware, use fasteners of
the same grade.
IMPORTANT! The torque specifications in these tables
are for non-greased or non-oiled threads. Do not grease
or oil fastener threads unless otherwise indicated. When
using a thread lock, increase the specified torque 5%.
Bolt grades are identified by the marks on the
bolt head.
The bolt torque specification tables provide the correct
torque settings for common bolts and capscrews. Tighten
all bolts to the torque that is specified in the table, unless
otherwise indicated. Check the bolt tightness periodically.
Imperial Bolt Torque Specifications
Bolt
Diameter
Torque
SAE Gr. 2
SAE Gr. 5
SAE Gr. 8
lbf•ft
N•m
lbf•ft
N•m
lbf•ft
N•m
1/4 inch
6
8
9
12
12
17
5/16 inch
10
13
19
25
27
36
3/8 inch
20
27
33
45
45
63
7/16 inch
30
41
53
72
75
100
1/2 inch
45
61
80
110
115
155
9/16 inch
60
95
115
155
165
220
5/8 inch
95
128
160
215
220
305
3/4 inch
165
225
290
390
400
540
7/8 inch
170
230
420
570
650
880
Metric Bolt Torque Specifications
Bolt
Diameter
Torque
Gr. 8.8
Gr. 10.9
lbf•ft
N•m
lbf•ft
N•m
M3
0.4
0.5
1.3
1.8
M4
2.2
3
3.3
4.5
M6
7
10
11
15
M8
18
25
26
35
M10
37
50
52
70
M12
66
90
92
125
M14
83
112
116
158
M16
166
225
229
310
M20
321
435
450
610
M30
1,103
1,495
1,550
2,100
WP525
Firewood Processor
Specifications
65
