Page 601 - SKF-bearing-housings

Sealing solutions

Table 1
Seals for SKF housings for paper machines

SBFN SBPN SDM
Seal
Type Labyrinth Labyrinth Gap seal with oil flinger
Material grey cast iron grey cast iron grey cast iron, steel
Application conditions and
requirements
Temperature [°C] –40 to +200 –40 to +200 –40 to +200
Temperature [°F] –40 to +390 –40 to +390 –40 to +390
Max. circumferential speed [m/s] bearing dependent bearing dependent bearing dependent
Max. misalignment [°] 0,5 0,5 0,3
Low friction ++ ++ ++
Shaft tolerance class h9V E h9V E h9V E
Shaft roughness R a [µm] ≤ 3,2 ≤ 3,2 ≤ 3,2

Sealing suitability
Dust – – –
Fine particles + + +
Coarse particles + + +
Pressure-wash + + –
Running water ++ ++ –

13
Symbols: ++ very suitable + suitable – limited suitability –– unsuitable

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