71
2.
Inst
allatio
n
(2) Installation by Square Nuts
Square nuts prescribed in JIS B 1163 can be used for the T-slots.
Quantities of the square nuts enclosed at the time of shipment are as follows.
(Note) When optional T-slot nut bars (model: NTB) are selected, the square nuts are not enclosed.
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
Quantities
Enclosed
4
4
6
8
Attachment
Bolts
M4
M6
M6
M8
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.