Page 563 - SKF-bearing-housings

Sealing solutions

Table 1
Standard seals for PD two-bearing housings

Seal
Type V-ring seal Felt strip and V-ring seal
Ho using series PDN 2, PDP PDN 3, PDR
Material nitrile rubber felt, nitrile rubber

Application conditions and requirements
Temperature [°C] –40 to +100 –40 to +100
Temperature [°F] –40 to +210 –40 to +210
Max. circumferential speed 1) [m/s] 7 2) 4 3)
Low friction ++ –
Shaft tolerance class † page 564 † page 564
Shaft roughness R a [µm] 3,2 3,2
Sealing suitability
Dust + +
Fine particles + +
Coarse particles + +
Chips –– +
Liquids when sprayed + +
Direct sunlight –– +

Symbol: ++ very suitable 12
+ suitable
– limited suitability
–– unsuitable

1) To convert circumferential speeds to rotational speeds, refer to table 7 on page 37.
2) lf located axially, higher speeds are possible.
3) At higher speeds, a small gap forms between the felt and the shaft.

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