C4 Maintenance 2. General Maintenance
12 C Series Maintenance Manual Rev.2
2.4 Tightening Hexagon Socket Head Bolts
Hexagon socket head cap bolts (hereinafter, “bolts”) are used in places where mechanical
strength is required. These bolts are fastened with the tightening torque shown in the
following tables.
When it is required to refasten the bolts in some procedures in this manual (except special
cases as noted), use a torque wrench so that the bolts are fastened with appropriate tightening
torque as shown below.
See below for the set screw.
2.0 ± 0.1 N⋅m
± 1 kgf⋅cm)
4.0 ± 0.2 N⋅m
± 2 kgf⋅cm)
2.4 ± 0.1 N⋅m
± 1 kgf⋅cm)
8.0 ± 0.4 N⋅m
± 4 kgf⋅cm)
3.9 ± 0.2 N⋅m
± 2 kgf⋅cm)
13.0 ± 0.6 N⋅m
± 6 kgf⋅cm)
32.0 ± 1.6 N⋅m
± 16 kgf⋅cm)
58.0 ± 2.9 N⋅m
± 30 kgf⋅cm)
100.0 ± 5.0 N⋅m
± 51 kgf⋅cm)
recommended to fasten the bolts aligned on a circumference in a crisscross pattern as
below.
1
5
3
7
2
6
4
8
Bolt hole
bolts securely at one time. Divide
to fasten the bolt
s into two or
three and fasten the
bolts securely with a hexagonal
wrench. Then, use a torque wrench to fasten the
bolts with tightening torques shown in the table
above.
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