Page 542 - SKF-bearing-housings

Flanged housings FNL series

Sealing solutions
Table 2
Double-lip seals for FNL flanged housings
FNL flanged housings are equipped with low-
friction, double-lip grease seals († fig. 8).
Table 2 provides an overview of the charac-
teristics and suitability of the sealing solution.
This information should be used as a guideline
and does not substitute for testing a seal in its
application.
Seals are supplied with the housing. If addi-
tional seals are needed, they can be ordered
Type Double-lip
separately. They are identified by the designa-
Designation TFL 5.. tion prefix TFL followed by a number indicat-
ing the size, e.g. TFL 511.
Size range 505 to 522
Material HNBR (hydrogenated
nitrile butadiene
rubber)
Application conditions and requirements
Temperature [°C] –25 to +120
Temperature [°F] –15 to +250
Max. circumferential speed 1) [m/s] 8
Max. misalignment [°] 0,5
Low friction +
Axial shaft displacement ++
Vertical shaft arrangement +
Replacement +
Shaft tolerance class h9V E
Shaft roughness R a [µm] ≤ 3,2
Sealing suitability
Dust ++
Fig. 8
Fine particles ++
Coarse particles ++
Chips +
Liquids when sprayed +
Direct sunlight +

Symbols: ++ very suitable
+ suitable

1) To convert circumferential speeds to rotational speeds
† table 7 on page 37

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