Epson RC620 Safety And Installation page 120

5. General Maintenance
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.
The bolts aligned on a circumference should be fastened in a crisscross pattern as
shown in the figure below.
Bolt hole
108
Bolt
M3
M4
M5
M6
M8
M10
M12
Refer below for the set screw.
Set Screw
M3
M4
M5
1
5
8
3
6
7
2
Tightening Torque
245 N⋅cm (25 kgf⋅cm)
490 N⋅cm (50 kgf⋅cm)
980 N⋅cm (100 kgf⋅cm)
1,760 N⋅cm (180 kgf⋅cm)
3,720 N⋅cm (380 kgf⋅cm)
7,350 N⋅cm (750 kgf⋅cm)
12,740 N⋅cm (1,300 kgf⋅cm)
Tightening Torque
147 N⋅cm (15 kgf⋅cm)
245 N⋅cm (25 kgf⋅cm)
392 N⋅cm (40 kgf⋅cm)
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
4
a torque wrench so that the bolts are fastened
with tightening torques shown in the table
above.
RC620 Safety and Installation Rev.8