Service manual

2. Overhauling
2-3
2.2 Tightening Torque
2.2.1 General tightening torque of bolts and nuts
Fasten all the bolts and nuts with the specified tightening torque when assembling.
Low or medium carbon steel bolt
(SS400B, etc.)
High strength steel bolt
(SCM435, etc.)
lbw
･
ft
N
•
m (kgf
•
cm)
lbw
･
ft
N
•
m (kgf
•
cm)
6 3.7 5 (51) 7.2 10 (100)
8 9.0 12 (124) 18 25 (245)
10 18 25 (245) 35 49 (485)
12 31 43 (425) 61 85 (845)
14 49 68 (675) 98 135 (1350)
16 76 106 (1055) 152 210 (2100)
18 105 145 (1450) 210 290 (2900)
20 148 205 (2050) 297 410(4100)
22 203 280 (2800) 405 560 (5600)
24 250 345 (3450) 514 710 (7100)
Applied sections.
For general sections such as bonnet
and frame.
For specified sections.
 Each clamping torque listed in the above-mentioned table applies to bolts being used
for generators.
 The list shows normal clamping torque. In some sections, special specified torque is
required. In such a case, use the specified torque only.
 Make sure to remove rust and dust before tightening.
4.6−6.8 (4T−6T)
Indication does
not appear in
some cases.
Hexagon headed bolt
8.8−12.9 (7T−12T)
Socket bolt
Hexagon headed bolt
Type
Strength,
classification,
and indication
example
Torque
Nominal diameter
(mm)