Catalogue SKF spherical plain bearings & rod ends (4407/II E)
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2 Recommendations
3 Product data
1 Product information
Page................4 Page ..............16 Spherical plain thrust bearings
Fig|3
Fig|4
Dimensions
The principal dimensions of SKF spher­ical plain thrust bearings conform to ISO 12240-3:1998.
Tolerances
SKF spherical plain thrust bearings are made to the tolerances specified in Table n . The tolerances conform to ISO 12240-3:1998.
The symbols used in the tolerance table are explained in the following.
d nominal bore diameter Admp deviation of the mean bore
diameter from the nominal D nominal outside diameter ADmp deviation of the mean outside
diameter from the nominal ABs deviation of single shaft washer
width from the nominal ACs deviation of single housing
washer width from the nominal ATs deviation of single height of
thrust bearing from the nominal
Materials
The shaft and housing washers of SKF spherical plain thrust bearings are made of through hardened and ground steel. The sliding surface of the shaft washer is hard chromium plated and coated with a lithium base grease. The sliding layer of glass fibre reinforced plastic containing PTFE additives is injection moulded in the housing washer.
Steel-on-steel spherical plain thrust bearing with lubrication hole and groove
Maintenance-free thrust bearing with sliding contact surface combination steel/PTFE fabric
Special designs
Special operating conditions may call for spherical plain thrust bearings with the sliding contact surface combina­tions steel-on-steel or steel/PTFE fabric and consequently they are pro­duced to order by SKF.
Steel-on-steel bearings fig [3 ) are preferred where operating tempera­tures, loads or load frequencies are high or where shock loads occur.
Bearings with the sliding contact surface steel/PTFE fabric fig u ) should be used when maintenance-free operation is specified and where the bearing arrangement is such that the presence of any lubricant is not permitted.
Permissible operating temperature range
Spherical plain bearings with the slid­ing contact surface combination steel/PTFE composite can be used in the temperature range -40 to +75 °C, although brief periods of operation up to +110 °C are permitted. However, the load carrying capacity of the bear­ings will be reduced at temperatures above +50 °C.
Tolerances of spherical plain thrust bearings
Table 1
Nominal
Shaft washer
Housing washer
Single height
d, D
Admp
Abs
ADmp
Acs
Ats 11
over
incl.
high
low
high low
high low
high low
high
low
mm
|jm
|m
|m
|m
|m
18 30
18 30 50
0 0 0
-8
-10
-12
0 -240 0 -240
0 -240
0 -11
0
-240
+250 +250 +250
-400 -400 -400
50 80 120
80
120
150
0 0
-15 -20
0 -300
0 -400
0 -13 0 -15 0 -18
0 0 0
-300 -400 -500
+250 +250
-500 -600
150
180
180 230
-
-
--
0 -25 0 -30
0 0
-500
-600
-
-
1) The width tolerance is related to d
93
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