Hitachi ZW180 Operator's Manual page 304

Nuts and Bolts Tightening Torque
When checking the machine parts, if loose nuts and bolts
are found, retighten them to the torque values shown in
the table below.
Tightening Torque Table
Bolt
Dia.
mm
Standard Allowable torque
torque
N•m kgf•cm
4 1.15 11.7 0.92 to 1.38 9.4 to 14.1 3.06
5 2.36 24.1 1.89 to 2.82 19.3 to 28.8 6.30
6 4.98 40.6 3.20 to 4.79 32.6 to 48.8 10.6
8 9.81 100 7.84 to 11.7 79.9 to 119 26.1
10 19.5 199 15.6 to 23.4 159 to 239 52.1
12 34.2 349 27.5 to 41.1 280 to 419 91.2
14 55.0 561 43.9 to 65.9 448 to 672 146
16 86.9 886 69.5 to 104 709 to 1060 232
18 118 1200 94.6 to 142 965 to 1450 315
20 171 1740 136 to 204
22 234 2390 187 to 252
24 293 2990 234 to 352
27 436 4450 349 to 524
30 588 6000 471 to 706
33 810 8260 648 to 972
36 1030 10500 828 to 1250
1080
39 1350 13800
to 1140
M4GB-07-121
Standard
range torque
N•m kgf•cm N•m kgf•cm
1390
452
to 2080
1910
624
to 2570
2390
782
to 3590
3560
1160 11800 931 to 1400
to 5340
4800
1570 16000
to 7200
6610
2160 22000
to 9910
8440
2770 28200
to 12700
11000
3600 36700
to 11650
MAINTENANCE
IMPORTANT:
• Remove soil, rust, and/or dirt from the nut and
bolt thread surfaces before tightening.
• Tighten nuts and bolts to specifications. If tight-
ened with excessively low or high torque, miss-
ing or breakage of nuts and/or bolts may result.
Hexagon head bolt
M4GB-07-122
Allowable torque
range
N•m kgf•cm
31.2 2.45 to 3.67 25.0 to 37.4 4.49
64.2 5.03 to 7.55 51.3 to 77.0 9.24
108 8.50 to 12.7 86.7 to 130 15.6
266 20.9 to 31.0 213 to 319 38.3
531 41.6 to 62.5 424 to 638 76.5
930 73.1 to 109 745 to 1110 133
1190
1490 117 to 177
to 1800
1890
2370 185 to 279
to 2840
2570
3210 252 to 379
to 3860
3690
4610 362 to 543
to 5540
5090
6360 499 to 749
to 7640
6380
7970 626 to 938
to 9560
9490
to 14300
1260 12800
to 1880 to 19200
1730 17600
to 2590 to 26400
2210 22500
to 3310 to 33800
2880 29400
to 4320 to 44100
7-104
Standard Allowable torque
torque range
N•m kgf•cm N•m
45.8 3.60 to 5.39
94.2 7.40 to 11.1 75.5 to 113
159 12.6 to 18.7 128 to 191
391 30.7 to 46.0 313 to 469
780 61.2 to 91.8 624 to 936
1360 108 to 161
216 2200 173 to 258
341 3480 272 to 409
463 4720 370 to 555
665 6780 534 to 797
918 9360 734 to 1100
1150 11700 919 to 1380
1370
1720 17500
to 2050
1840
2300 23500
to 2770
2540
3170 32300
to 3810
3240
4060 41400
to 4860
4240
5290 53900
to 6350
Wrench
M4GB-07-123
size mm
kgf•cm
36.7 to
7
55.0
8
10
13
17
1100
19
to 1640
1760
22
to 2630
2770
24
to 4170
3770
27
to 5660
5440
30
to 8130
7480
32
to 11200
9370
36
to 14100
14000
41
to 20900
18800
46
to 28200
25900
50
to 38800
33000
55
to 49600
43200
60
to 64800