Page 172 - Y-bearing-units

Flanged Y-bearing units

Data – general Fig. 12
Dimensions T
The boundary dimensions for most flanged
Y-bearing housings are in accordance with the
following standards:

• Housings in the FY, FYT and FYTB series are
in accordance with ISO 3228:1993.
• Housings in the FYJ, FYTJ and FYC series
are in accordance with JIS B 1559-1995.
• Housings in the PF, PFD and PFT series
are in accordance with ISO 3228:1993.

Tolerances
For flanged Y-bearing units with a cast housing,
the tolerance for the total width T of the unit
(† fig. 12) is: Materials

• ±0,5 mm for units up to and including 50 mm Composite housings
bore diameter These housings are made of injection moulded
• ±0,6 mm for larger units glass fibre reinforced polyamide 6. A steel coil
embedded in the housing adds greater stability
For flanged Y-bearing units with housings made to the form of the housing, even if temperatures
of composite material or grey cast iron, the out- are elevated.
side diameter of the bearing is matched to the The bolt holes for housings in the FYK and
diameter of the housing bore so that the outer FYTBK series are reinforced with zinc-plated
ring is prevented from turning in its seat, but sheet steel inserts. The standard housing colour
still able to compensate for misalignment. is black.
Additional information about tolerances for
the inner ring bore are listed in the section Cast housings
Y-bearings on page 89. Cast housings are manufactured from grey cast
iron EN-GJL HB195 in accordance with
EN 1561:1997.
Radial internal clearance
The Y-bearing used in a flanged Y-bearing unit Pressed steel housings
has the same radial internal clearance as a Pressed steel housings are made from cold-rolled
similarly sized individual Y-bearing. steel and are zinc-coated for corrosion protection.
Additional information about the radial
internal clearance can be found in the section
Y-bearings on page 90. Load carrying ability of the housings
Housings made of either composite material
or grey cast iron are able to withstand the same
dynamic and static loads as the Y-bearings they
incorporate. These Y-bearing units can also be
used for applications where shock loads or vari-
able axial loads occur.
If SKF Y-bearing units are to be used in an
application where health, safety, or the environ-
ment is at risk, contact the SKF application engin-
eering service during the design phase.

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