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TIGHTENING TORQUE SPECIFICATIONS
170
4.5 TIGHTENING TORQUE SPECIFICATIONS
4.5.1 TIGHTENING TORQUE LIST
CAUTION
• If nuts, bolts, or other parts are not tightened to the specified torque, it will cause looseness or damage
to the tightened parts, and this will cause failure of the machine or problems with operation.
Always pay careful attention when tightening parts.
Unless otherwise specified, tighten the metric nuts and bolts to
the torque shown in the table below.
If it is necessary to replace any nut or bolt, always use a Ko-
matsu genuine part of the same size as the part that was re-
placed.
IMPORTANT
• This driving torque table is not valid for screws or nuts that must lock parts made of nylon or similar ma-
terials on to washers or components made of nylon or nonferrous materials.
RYA02980
Thread
diameter of bolt
(a)(mm)
Width across
flats (b)(mm)
Tightening torque
Target value Service limit
Nm kgm Nm kgm
8
10
12
14
10
13
17
19
22 13.2
31
66
113
172
1.35
3.2
6.7
11.5
17.5
11.8-14.7
27-34
59-74
98-123
153-190
11.8-14.7
27-34
59-74
98-123
153-190
16
18
20
22
24 24
27
30
32
36 260
360
510
688
883 26.5
37
52.3
70.3
90
235-285
320-400
455-565
610-765
785-980 23.5-29.5
33.0-41.0
46.5-58.0
62.5-78.0
80.0-100.0
27
30
33
36
39 41
46
50
55
60 1295
1720
2210
2750
3280 132.5
175.0
225.0
280.0
335.0 1150-1440
1520-1910
1960-2450
2450-3040
2890-3630
118.0-147.0
155.0-195.0
200.0-250.0
250.0-310.0
295.0-370.0