Mounting
4.3 Mounting instructions
Planetary gearboxes for servomotors
40
Operating Instructions, 09/2020, A5E50494253B AA
Flange mounting of NRB, NRK and NP planetary gearboxes
NRB
For gearboxes with aluminum output flange, use screws with a maximum property class of 10.9,
assuming that you use 90 % of the screw yield strength.
Gearbox size
Mounting
flange
Ø circle of
holes
in mm
Number of
threads
Thread size
Thread depth
in mm
Property class
of the screws
040
IM B14
34
4
M4
6
10.9
060
52
M5
8
080
70
M6
10
120
100
M10
16
160
145
M12
20
NRK
Gearbox size
Mounting
flange
Ø circle of
holes in mm
Number of
threads
Thread size
Thread depth
in mm
Property class
of the screws
050
IM B14
44
4
M4
8
12.9
070
62
M5
8
090
80
M6
9
120
108
M8
20
155
140
M10
20
NP
Gearbox size
Mounting
flange
Ø circle of
holes in mm
Number of
threads
Thread size
Thread depth
in mm
Property class
of the screws
005
IM B14
44
4
M4
8
12.9
015
62
M5
10
025
80
M6
12
035
108
M8
16
045
140
M10
20
NLC
Gearbox size
Mounting
flange
Ø circle of
holes
in mm
Number of
threaded bores
Bore diameter
in mm
Flange thick-
ness
in mm
Property class
of the screws
050
IM B5
68-75
4
5.5
7
12.9
070
85
6.5
8
090
120
9
10
