Page 74 - SKF-bearing-housings

Split plummer block housings SNL 2, 3, 5 and 6 series

Special seals Fig. 9
Taconite heavy-duty seals
I n addition to the standard seal assortment,
SNL housings are available, on request, with
high-temperature seals, taconite heavy-duty
seals with an axial labyrinth, or custom seals
for special applications.

High-temperature seals
For high operating temperatures, up to 250 °C
(480 °F), high-temperature felt seals or strips
should be used. The felt seals can accommo-
date circumferential speeds up to 2 m/s. They
are identified by the designation suffix CB, e.g.
TSN 516 CB. For additional information about TSN.. NC TSN.. NB
the felt strips, contact the SKF application
engineering service.
Table 7
Taconite heavy-duty seals with an axial labyrinth
Taconite heavy-duty seals with an axial
labyrinth
Seal
Taconite heavy-duty seals with an axial laby- Designation TSN .. NC TSN .. NB
rinth (TSN .. NC or TSN .. NB, † fig. 9) can be
used under the same conditions as taconite Size range 515 to 532 515 to 532
612 to 620
612 to 620
seals with a radial labyrinth. The seals are
greased via a hole in the housing cap. There- Application conditions and requirements
fore, they can only be used with housings with
the suffix T (at the end of a shaft) or the suffix Temperature [°C] –40 to +250 –40 to +100
TD (for through shafts). Temperature [°F] –40 to +480 –40 to +210
TSN .. NB seals have a V-ring. It limits the Max. circumferential not limited 12
axial movement of the shaft relative to the speed [m/s] 1)
housing to ±1 mm for shaft diameters up to Max. misalignment [°] 0,5 0,5
65 mm and to approximately ±1,2 mm for
sizes up to 100 mm and ±1,5 mm for larger Max. axial shaft ±2,5 ±1 to 1,5
displacement from a
shaft diameters. central position [mm]
Specifications for the seals are listed in
table 7. Shaft tolerance class h9V E h9V E

1) To convert circumferential speeds to rotational speeds,
refer to table 7 on page 37.

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