Page 69 - SKF-bearing-housings

Sealing solutions
2
Table 3
Standard sealing solutions for SNL plummer block housings

Seal
Type Four-lip V-ring Felt seal Felt strip Labyrinth Taconite End cover
split split split
Designation TSN .. L TSN .. A TSN .. C FS 170 TSN .. S TSN .. ND ASNH ..
Material thermoplastic nitrile rubber, felt, nitrile felt steel, silicone steel, nitrile polymer
polyester steel rubber, rubber
elastomer aluminum
Seals per pack 2 seals 2 seals 2 seals 1 strip 2) 1 seal 1 seal 1 end cover
Application conditions and requirements
Temperature [ ° C ] – 40 to +100 –40 to +100 –40 to +100 –40 to +100 –50 to +200 –40 to +100 –40 to +110
Temperature [°F] –40 to +210 –40 to +210 –40 to +210 –40 to +210 –60 to +390 –40 to +210 –40 to +230
Max. circumferential 13 7 2) 4 2) 4 2) not limited 12 n/a
speed 1) [m/s]
Max. misalignment [°] 1 to 0,5 1,5 to 1 0,5 0,5 0,3 0,5 n/a
Low friction ++ ++ – – ++ + n/a
Axial shaft displacement ++ – ++ ++ + + n/a
Vertical arrangement + ++ 3) – – – – – – – ++
Replacement ++ – + + – – ++
Shaft tolerance class h9V E n/a h9V E h9V E h9V E h9V E n/a
Shaft roughness R a [µm] ≤ 3,2 n/a ≤ 3,2 ≤ 3,2 ≤ 3,2 ≤ 3,2 n/a
Sealing suitability
Dust ++ + – – – ++ ++
Fine particles ++ + – – + ++ ++
Coarse particles ++ + + + + ++ ++
Chips + – – + + ++ ++ ++
Liquids when sprayed + + – – – – ++ ++
Direct sunlight + – – ++ ++ ++ ++ ++
Symbols: n/a not applicable, ++ very suitable, + suitable, – limited suitability, – – unsuitable

1) To convert circumferential speeds to rotational speeds † table 7, page 37
2) Higher speeds are possible. For details, refer to the text about the relevant seal.
3) For details see text about the relevant seal.

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