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MAINTENANCE
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
TORQUE LIST
Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below.
The tightening torque is determined by the width across the flats (b) of the nut and bolt.
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.
Thread
diameter
of bolt
(mm) (a)
Width
across
flats
(mm) (b)
Tightening torque [N
·
m (kgf
·
m)]
Target value Permissible range
6
8
10
12
14
10
13
17
19
22
13.2 (1.35)
31 (3.2)
66 (6.7)
113 (11.5)
177 (18.0)
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)
157 - 196 (16.0 - 20.0)
16
18
20
22
24
24
27
30
32
36
279 (28.5)
382 (39.0)
549 (56.0)
745 (76.0)
927 (94.5)
245 - 309 (25.0 - 31.5)
343 - 425 (35.0 - 43.5)
490 - 608 (50.0 - 62.0)
662 - 829 (67.5 - 84.5)
824 - 1030 (84.0 - 105.0)
27
30
33
36
39
41
46
50
55
60
1320 (135.0)
1720 (175.0)
2210 (225.0)
2750 (280.0)
3280 (335.0)
1180 - 1470 (120.0 - 150.0)
1520 - 1910 (155.0 - 195.0)
1960 - 2450 (200.0 - 250.0)
2450 - 3040 (250.0 - 310.0)
2890 - 3630 (295.0 - 370.0)
NOTICE
When tightening panels or other parts having tightening fixtures made of plastic, be careful not to use excessive torque: doing
so will damage the plastic parts. Pay enough attention when you tighten up.
Apply the following table for Hydraulic Hose.
Thread
diameter
a (mm)
Width
across
flats
b (mm)
Tightening torque
Target value Permissible range
N
·
mkgf
·
mlbft N
·
mkgf
·
mlbft
10 14 14.7 1.5 10.8 12.7 - 16.7 1.3 - 1.7 9.4 - 12.3
14 19 29.4 3.0 21.7 27.5 - 39.2 2.8 - 4.0 20.3 - 28.9
18 24 78.5 8.0 57.9 58.8 - 98.1 6.0 - 10.0 43.4 - 72.3
22 27 117.7 12.0 86.6 88.3 - 137.3 9.0 - 14.0 65.1 - 101.3
24 32 147.1 15.0 108.5 117.7 - 176.5 12.0 - 18.0 86.8 - 130.2
30 36 215.7 22.0 159.1 176.5 - 245.2 18.0 - 25.0 130.2 - 180.8
33 41 255.0 26.0 188.1 215.7 - 284.4 22.0 - 29.0 159.1 - 209.8
4 - 12
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