Tightening Hexagon Socket Head Cap Bolts - Epson E2C Series Manipulator Manual

Maintenance 2. General Maintenance

2.4 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.
We recommend that the bolts aligned on a circumference should be fastened in a crisscross
pattern as shown in the figure below.
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 fastened with tightening torques shown in the
table above.
76
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)
1
5
3
7
2
8
4
6
E2C Rev.6