72
2.
Inst
allatio
n
(3) Installation by T-Slot Nut Bar (Option Model: NTB)
Four T-slot nut bars (option model: NTB) are shipped in a built-in-state in all sizes.
Before you use them, loosen the hexagonal socket head fixing screws in the center of the nuts to
move them to the desired positions. Do not overly tighten the hexagonal socket head fixing screws,
for they are used only for positioning. Use the nut bars in a pitch as wide as possible to stabilize
the mounting.
Adjust the screw length from the base bottom according to the following table to ensure the fitting
length of the nut and the screw.
Install them according to the minimum fixing number of bolts and the tightening torque in the
following table.
RA4
RA6
RA7
RA8
Minimum Fixing Number (Bolts)
4
4
6
8
Tightening
Torque[Nm]
When the bolt seating
surface is steel
3.59
12.34
12.34
29.9
When the bolt seating
surface is aluminum
1.76
5.36
5.36
11.48
RA4
RA6
RA7
RA8
Screw Length
[mm]
From the Base
Bottom
5 to 7
7.5 to 8.5
8 to 10
11 to 13
Caution: Be careful when selecting the bolt length. If bolts of inappropriate lengths are
used, the tapped holes may be damaged, actuator mounting strength may
become insufficient, or contact with driving parts may occur, resulting in lower
precision or unexpected accidents.