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Tightening Bolts and Nuts
d
CAUTION: Use tools appropriate for the work
to be done. Makeshift tools and procedures
can create safety hazards. For loosening and
tightening nuts and bolts, use correct size tools.
Otherwise, tightening tools may slip, potentially
causing personal injure.
Bolt Types
Tighten the nuts or bolts correctly to the torque
specifications.
As the different types and grades of bolt are used,
use and tighten the correct bolts correctly when
assembling the machine or components.
Specified Tightening Torque Chart
Bolt
Hexagon Head Bolt
Dia.
mm
WDAA-01-02-002
N·m
(lbf·ft)
6
8
30
(22)
10
65
(48)
12
110
(81)
14
180
(133)
16
270
(200)
18
400
(300)
20
550
(410)
22
750
(550)
24
950
(700)
27
1400
(1030)
30
1950
(1440)
33
2600
(1920)
36
3200
(2360)
WLBJE0-EN-00
SECTION 1 GENERAL
Group 2 Tightening
WDAA-01-02-003
N·m
(lbf·ft)
N·m
3 to 4
20
(15)
10
50
(37)
20
90
(66)
35
140
(103)
55
210
(155)
80
300
(220)
120
400
(300)
170
550
(410)
220
700
(520)
280
1050
(770)
400
1450
(1070)
550
1950
(1440)
750
2450
(1810)
950
W1-2-1-1
Socket Bolt
Wrench
Socket Bolt
Size mm
WDAA-01-02-004
(lbf·ft)
N·m
(2.2 to 3)
10
(7.4)
13
20
(15)
17
50
(26)
19
90
(41)
22
140
(59)
24
210
(89)
27
300
(125)
30
400
(162)
32
(205)
36
(300)
41
(410)
46
(550)
50
(700)
55
WDAA-01-02-001
2013/09
Wrench
Size mm
(lbf·ft)
5
(15)
6
(37)
8
(66)
10
(103)
12
(155)
14
(220)
14
(300)
17
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