Page 466 - SKF-bearing-housings

Split pillow blocks SDAF series including the extended range (inch dimensions)

Special seals Design considerations

In addition to the standard seal assortment, For general information about system design,
high-temperature contact seals and high- refer to the following sections:
speed seals are available on request, for SDAF
housings. • Typical shaft-bearing combinations
(† page 41)
• Locating/non-locating bearing arrangements
High-temperature seals († page 40)
High-temperature contact seals (designation • Load carrying capacity († page 44)
LORP) consist of a PTFE labyrinth ring with an • Axial load carrying capacity for bearings on
FKM (fluoro rubber) O-ring and a PTFE con- sleeves († page 44)
tact element. The PTFE contact element is • Specifications for shafts and housing support
available separately (designation B-10785). surfaces († page 45)
High-temperature seals can accommodate
operating temperatures up to 400 °F. The lim- For additional information about rolling bear-
iting speed for the bearing can be attained. ings and adapter sleeves, refer to the product
information available online at skf.com/
bearings.
High-speed seals
High-speed contact seals consist of an alu-
minium labyrinth ring with an NBR O-ring Typical shaft-bearing combinations
(designation LOR) and a PTFE contact element All SDAF housings can accommodate different
(designation B-10785). With PTFE contact shaft-bearing combinations († fig. 6):
elements, the limiting speed for the bearing
can be attained. • Plain shaft with bearing on an adapter
sleeve
• Stepped shaft with bearing on a cylindrical
seat

Plain shaft with bearing on an adapter sleeve
This arrangement is standard for SDAF pillow
blocks in the 225 and 226 series and for SDAF
extended range housings in the 230..KA,
231..KA and 232..KA series. Housings, appro-
priate parts and dimensions are listed in prod-
uct tables 9.1 († page 472) and 9.3
(† page 476).
Stepped shaft with bearing on a cylindrical seat
This arrangement is standard for SDAF hous-
ings in the 222 and 223 series and for SDAF
extended range housings in the 230, 231 and
WARNING! 232 series. Housings, appropriate parts and
Seals made of FKM (flouro rubber) or dimensions are listed in product tables 9.2
PTFE exposed to an open flame or tem- († page 474) and 9.4 († page 480).
peratures above 570 °F are a health and
environmental hazard! Contact SKF for
detailed safety instructions.

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