Standard Tightening Torques For Bolts And Nuts; Torque List - Komatsu WA500-6H Operation & Maintenance Manual

Maintenance
4.5

Standard tightening torques for bolts and nuts

4.5.1

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 oper-
ation.
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
KOMATSU genuine part of the same size as the part that was
replaced.
Width
Thread
across
diameter of
flats
bolt (a)(mm)
(b)(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
WA500-6H – VEAM430100
Target value
N·m kgf·m lbft
13.2 1.35 9.8
31 3.2 23.1
66 6.7 48.5
113 11.5 83.2
172 17.5 126.6
260 26.5 191.7
360 37 267.6
510 52.3 378.3
688 70.3 508.5
883 90 651
1295 132.5 958.4
1720 175.0 1265.8
2210 225.0 1627.4
2750 280.0 2025.2
3280 335.0 2423.1
4.5 Standard tightening torques for bolts and nuts
Tightening torque
Service limit
N·m kgf·m
11.8-14.7 1.2-1.5
27-34 2.8-3.5
59-74 6.0-7.5
98-123 10.0-12.5
153-190 15.5-19.5
235-285 23.5-29.5
320-400 33.0-41.0
455-565 46.5-58.0
610-765 62.5-78.0
785-980 80.0-100.0
1150-1440 118.0-147.0
1520-1910 155.0-195.0
1960-2450 200.0-250.0
2450-3040 250.0-310.0
2890-3630 295.0-370.0
Torque list
lbft
8.7-10.8
20.3-25.3
43.4-54.2
72.3-90.4
112.1-141
170.0-213.4
238.7-296.6
336.3-419.5
452.1-564.2
578.6-723.3
853.5-1063.3
1121.1-1410.4
1446.6-1808.3
1808.3-2242.2
2133.7-2676.2
GK032236
4-19