Standard Tightening Torque For Bolts And Nuts - Komatsu D85EX-18 Operation & Maintenance Manual

MAINTENANCE
STANDARD TIGHTENING TORQUE FOR BOLTS AND
NUTS
Tightening torque list
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 be
careful 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, Komatsu recom-
mends using Komatsu genuine part of the same size as the
part that is removed.
Thread Width
diameter across
of bolt flats (b)
(a) (mm) (mm)
6 10
8 13
10 17
12 19
14 22
16 24
18 27
20 30
22 32
24 36
27 41
30 46
33 50
36 55
39 60
Apply the following table for hydraulic hose.
k k
Target value
Nm kgm
13.2 1.35
31 3.2
66 6.7
113 11.5
172 17.5
260 26.5
360 37.0
510 52.3
688 70.3
883 90.0
1,295 132.5
1,720 175.0
2,210 225.0
2,750 280.0
3,280 335.0

STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS

CAUTION
Tightening torque
Nm
11.8 - 14.7
27 - 34
59 - 74
98 - 123
153 - 190
235 - 285
320 - 400
455 - 565
610 - 765
785 - 980
1,150 - 1,440
1,520 - 1,910
1,960 - 2,450
2,450 - 3,040
2,890 - 3,630
Allowable range
kgm
1.2 - 1.5
2.8 - 3.5
6.0 - 7.5
10.0 - 12.5
15.5 - 19.5
23.5 - 29.5
33.0 - 41.0
46.5 - 58.0
62.5 - 78.0
80.0 - 100.0
118.0 - 147.0
155.0 - 195.0
200.0 - 250.0
250.0 - 310.0
295.0 - 370.0
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