REXNORD - MARBETT - MCC
B73
d
mm
r1, r2
min.
D
B
d2
D1
20
1204
47
14
28,9
41
1
12700
3400
15000
0,12
25
1205
52
15
33,3
45,6
1
14300
4000
13000
0,14
30
1206
62
16
40,1
53
1
15600
4650
10000
0,22
35
1207
72
17
47
62,3
1,1
19000
6000
9000
0,32
40
1208
80
18
53,6
68,8
1,1
19900
6950
8500
0,42
h6
h7
h8
h9
h11
17
9500
6000
4300
1500
950
20
8500
5300
3800
1300
850
25
7000
4500
3200
1000
700
30
6300
4000
2800
900
630
35
5300
3400
2200
750
530
40
4800
3000
1900
670
480
45
4300
2600
1700
600
430
50
4000
2400
1600
560
400
D1
D
B
d
d2
r2
r1
Bearings
Type
1200
The bearings have double row of balls running on a spherical outer race This
conIguration renders the bearing self aligning • The bearings are supplied without
sealing units • They are held into position by shoulders on the shaft.
Self aligning ball bearing
holding by shoulders on shaft
Seals
²oad coefIcient
Bearing
type
Dimensions in mm
dyn.
C
N
stat.
Co
N
Revolutions
RPM
Weight
Kg
The bearing locking systems by grub screws/eccentric collars, allow axial loads up
to 20% of the dynamic load coefIcient (only with non hardened shafts and grub
screws tightened as recommended) • For bearings of the
A
,
D
,
B
,
C
, series it is not
recommended to exceed the value of: 0,25•C
Axial load capacities
Type A - D
. The system consists of a metallic ring Itted with a low friction rubber
sealing lip.
Type B
. The system is further equipped with a metallic protection ring providing a
centrifugal sealing action.
Type C inox
. The upper lip of the centrifuging ring together with the grease trapped
between the base seal and the ring it self guarantees maximum sealing capacity.
Maximum velocities
The table indicates the values for
A
,
D
,
B
series bearings • Stainless steel bearings of
the
C
Type (rubberised centrifuging ring) must not be operated at velocities in excess
of 60% of the values indicated • The maximum velocity is dependant of the shaft
tolerances. Higher tolerances require lower speed
Int. dia.
bearing
d
mm
Shaft tolerance
Speed (RPM)
Type A - D
Metal ring
with
sealing lip
Type B
Centrifuging
ring
Type C Inox
Rubberised
centrifuging
ring