Tightening Hexagon Socket Head Bolts - Epson LS-B Series Manual

Regular Inspection 1. Regular Inspection for LS3-B LS6-B Manipulator

1.4 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.
Bolt
M10
M12
It is recommended to fasten the bolts aligned on a circumference in a crisscross pattern as
shown in the figure below.
Bolt hole
186
Tightening Torque
M3
2.0 ± 0.1 N⋅m (21 ± 1 kgf⋅cm)
M4 4.0 ± 0.2 N⋅m (41 ± 2 kgf⋅cm)
M5
8.0 ± 0.4 N⋅m (82 ± 4 kgf⋅cm)
M6 13.0 ± 0.6 N⋅m (133 ± 6 kgf⋅cm)
M8
32.0 ± 1.6 N⋅m (326 ± 16 kgf⋅cm)
58.0 ± 2.9 N⋅m (590 ± 30 kgf⋅cm)
100.0 ± 5.0 N⋅m (1,020 ± 51 kgf⋅cm)
1
5
3
7
2
See below for the set screw.
Set Screw
M4
M5
Do not fasten all bolts securely at one time. Divide the
8 number of times to fasten the bolts into two or three and
fasten the bolts securely with a hexagonal wrench.
Then, use a torque wrench to fasten the bolts with
4
tightening torques shown in the table above.
6
Tightening Torque
2.4 ± 0.1 N⋅m (26 ± 1 kgf⋅cm)
3.9 ± 0.2 N⋅m (40 ± 2 kgf⋅cm)
LS-B series Rev.5