STANDARD TIGHTENING TORQUE FOR BOLTS AND
NUTS
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 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 di-
ameter of
bolt “a”
(mm)
Width
across
flats “b”
(mm)
Tightening torque
Target value Allowable range
Nm kgm Nm kgm
6 10 13.2 1.35 11.8 to 14.7 1.2 to 1.5
8 13 31 3.2 27 to 34 2.8 to 3.5
10 17 66 6.7 59 to 74 6.0 to 7.5
12 19 113 11.5 98 to 123 10.0 to 12.5
14 22 177 18.0 157 to 196 16 to 20
16 24 279 28.5 245 to 309 25 to 31.5
18 27 382 39.0 343 to 427 35 to 43.5
20 30 549 56.0 490 to 608 50 to 62
22 32 745 76.0 662 to 829 67.5 to 84.5
24 36 927 94.5 824 to 1030 84 to 105
27 41 1320 135 1180 to 1470 120 to 150
30 46 1720 175 1520 to 1910 155 to 195
33 50 2210 225 1960 to 2450 200 to 250
36 55 2750 280 2450 to 3040 250 to 310
39 60 3280 335 2890 to 3630 295 to 370
Tighten the hoses to the torque shown in the table.
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS MAINTENANCE
4-10
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