5. General Maintenance
RC180 Safety and Installation Rev.18
93
Tightening Hexagon Socket Head Cap Bolts
Hexagon socket head cap bolts are used in places where mechanical strength is
required. (A hexagon socket head cap bolt will be called a “bolt” in this manual.)
These bolts are fastened with the tightening torques shown in the following table.
When it is necessary to refasten these bolts in some procedures in this manual
(except special cases as noted), use a torque wrench so that the bolts are fastened
with the appropriate tightening torques as shown below.
Bolt Tightening Torque
M3
245 N⋅cm (25 kgf⋅cm)
M4
490 N⋅cm (50 kgf⋅cm)
M5
980 N⋅cm (100 kgf⋅cm)
M6
1,760 N⋅cm (180 kgf⋅cm)
M8
3,720 N⋅cm (380 kgf⋅cm)
M10
7,350 N⋅cm (750 kgf⋅cm)
M12
12,740 N⋅cm (1,300 kgf⋅cm)
Refer below for the set screw.
Set Screw Tightening Torque
M3
147 N⋅cm (15 kgf⋅cm)
M4
245 N⋅cm (25 kgf⋅cm)
M5
392 N⋅cm (40 kgf⋅cm)
The bolts aligned on a circumference should be fastened in a crisscross pattern as
shown in the figure below.
1
5
3
7
2
6
4
8
Bolt hole
Do not fasten all bolts securely at one time.
Divide the number of times that the bolts are
fastened into two or three and fasten the bolts
securely with a hexagonal wrench. Then, use
a torque wrench so that the bolts are fastene
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