Catalogue SKF spherical plain bearings & rod ends (4407/II E)
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1 Product information
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Maintenance-free radial spherical plain bearings manufacturer
Table |l
16
Dimensions
The dimensions of the maintenance-free spherical plain bearings conform to ISO 12240-1:1998.
Tolerances
The tolerances to which maintenance-free radial spherical plain bearings are made are given in Table F ; they are in accordance to ISO 12240/1:1998. The symbols used are explained in the following.
Nominal diameter d, D
Inner ring
high low
Outer ring
ADmp
high low
Acs
high low
incl.
high low
over
|jm
|jm
jjm
jjm
mm
18
0
8
0
-120
0
-8
0
-240
18
30
0
-10
0
-120
0
-9
0
-240
30
50
0
-12
0
-120
0
-11
0
-240
50
80
0
-15
0
-150
0
-13
0
-300
80
120
0
-20
0
-200
0
-15
0
-400
120
150
0
-25
0
-250
0
-18
0
-500
150
180
0
-25
0
-250
0
-25
0
-500
180
250
0
-30
0
-300
0
-30
0
-600
250
315
0
-35
0
-350
0
-35
0
-700
315
400
0
-40
0
-400
0
-40
0
-800
400
500
0
-45
0
-450
0
-45
0
-900
500
630
0
-50
0
-500
0
-50
0
-1 000
630
800
0
-75
0
-750
0
-75
0
-1 100
800
1 000
0
-100
0
-1 000
0
-100
0
-1 200
1 000
1 250
0
-125
0
-1 250
0
-125
0
-1 300
1 250
1 600
-
-
-
0
-160
0
-1 600
1 600
2 000
-
-
-
0
-200
0
-2 000
d
Admp D
ADmp
Aßs
Acs
nominal bore diameter deviation of the mean bore diameter from the nominal nominal outside diameter deviation of the mean outside diameter from the nominal deviation of single inner ring width from the nominal deviation of single outer ring
width from the nominal
Radial internal clearance, preload
Maintenance free spherical plain bear­ings with a bore diameter up to and including 90 mm may have an internal clearance or a slight preload (negative clearance) because of their design. For these bearings, therefore, only the permissible maximum limit for bearing clearance is given in the table, and also only the permissible upper limit for the frictional moment depending on the preload in the circumferential direction under measuring load.
The radial internal clearance and the upper limit of the permissible frictional moment of bearings with the sliding contact surface combination steel/sin­ter bronze composite and steel/PTFE fabric are given in Table |2 . The values for the clearance limits of bearings with the sliding contact surface combination steel/PTFE composite are listed in Table [3 .
Tolerances of maintenance-free radial bearings
Permissible operating temperature range
The permissible operating temperature range of maintenance-free spherical plain bearings depends on the sliding contact surface combination and also on the polyester elastomer material of the seals Matrix m ). However, if the load carrying capacity of the bear­ings is fully exploited the temperature range is narrowed. Under normal loads it is possible to operate at temperatures above the upper limit for brief periods.
74
5KF
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