Komatsu WA470-5H User Manual

MAINTENANCE STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
4-13
STANDARD TIGHTENING TORQUES FOR BOLTS AND
NUTS 0.
TORQUE LIST 0.
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.
The tightening torque is determined by the width across the flats 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.
Apply the following table for Hydraulic Hose.
Thread
diame-
ter of
bolt
(a)(mm)
Width
across
flats
(b)(mm)
Tightening torque
Target value Service limit
N²m kgf²m lbft N²m kgf²m lbft
6
8
10
12
14
10
13
17
19
22
13.2
31
66
113
177
1.35
3.2
6.7
11.5
18
9.8
23.1
48.5
83.2
130.2
11.8-14.7
27-34
59-74
98-123
157-196
1.2-1.5
2.8-3.5
6.0-7.5
10.0-12.5
16.0-20.0
8.7-10.8
20.3-25.3
43.4-54.2
72.3-90.4
115.7-144.7
16
18
20
22
24
24
27
30
32
36
279
382
549
745
927
28.5
39
56
76
94.5
206.1
282.1
405.0
549.7
683.5
245-309
343-425
490-608
662-829
824-1030
25.0-31.5
35.0-43.5
50.0-62.0
67.5-84.5
84.0-105.0
180.8-227.8
253.2-314.6
361.7-448.4
488.2-611.2
607.6-759.5
27
30
33
36
39
41
46
50
55
60
1320
1720
2210
2750
3280
135.0
175.0
225.0
280.0
335.0
976.5
1265.8
1627.4
2025.2
2423.1
1180-1470
1520-1910
1960-2450
2450-3040
2890-3630
120.0-150.0
155.0-195.0
200.0-25.0
250.0-310.0
295.0-370.0
868.0-1085.0
1121.1-1410.4
1446.6-1808.3
1808.3-2242.2
2133.7-2676.2
Nominal - No. of
threads (a)
Width
across
flats
(b)(mm)
Tightening torque (N²m {kgf²m})
Target
value
Permissible range
9/16 -18UNF 19 44 {4.5} 35 - 63{3.5 - 6.5}
11/16 -16UN 22 74 {7.5} 54 - 93 {5.5 - 9.5}
13/16 -16UN 27 103 {10.5} 84 - 132 {8.5 - 13.5}
1 -14UNS 32 157 {16.0} 128 - 186 {13.0 - 19.0}
1•3/16 -12UN 36 216 {22.0} 177- 245 {18.0 - 25.0}

Komatsu WA470-5H Specifications

General

Brand	Komatsu
Model	WA470-5H
Category	Lifting Systems
Language	English