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Tightening Bolts and Nuts
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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.
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NOTE:
Apply lubricant (e.g. white zinc B dissolved into spindle
oil) to bolts and nuts to reduce friction coefficient of
them.
Make sure bolt and nut threads are clean before
installing.
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
Hexagon
Wrench
Bolt Dia.
Wrench
Size
Size
M6
10
5
M8
13
6
M10
17
8
M12
19
10
M14
22
12
M16
24
14
M18
27
14
M20
30
17
M22
32
M24
36
M27
41
M30
46
M33
50
M36
55
SECTION 1 GENERAL
Group 2 Tightening
WDAA-01-02-002
N·m
(kgf·m)
(lbf·ft)
30
(3)
(22)
65
(6.5)
(48)
110
(11)
(81)
180
(18)
(133)
270
(27)
(200)
400
(40)
(300)
550
(55)
(410)
750
(75)
(550)
950
(95)
(700)
1400
(140)
(1030)
1950
(195)
(1440)
2600
(260)
(1920)
3200
(320)
(2360)
W1-2-1-1
WDAA-01-02-003
Socket Bolt
N·m
(kgf·m)
(lbf·ft)
20
(2)
(15)
50
(5)
(37)
90
(9)
(66)
140
(14)
(103)
210
(21)
(155)
300
(30)
(220)
400
(40)
(300)
550
(55)
(410)
700
(70)
(520)
1050
(105)
(770)
1450
(145)
(1070)
1950
(195)
(1440)
2450
(245)
(1810)
WDAA-01-02-001
WDAA-01-02-004
N·m
(kgf·m)
(lbf·ft)
3 to 4
(0.3 to 0.4) (2.2 to 3)
10
(1)
(7.4)
20
(2)
(15)
35
(3.5)
(26)
55
(5.5)
(41)
80
(8)
(59)
120
(12)
(89)
170
(17)
(125)
220
(22)
(162)
280
(28)
(205)
400
(40)
(300)
550
(55)
(410)
750
(75)
(550)
950
(95)
(700)
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