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Y-bearing unit data


HousingsBearings
Dimension
standards
Boundary dimensions in accordance with:
  • ISO 3228:2013
    • FY, FYT and FYTB .. M series
    • FYK and FYTBK series
    • PFT, PF and PFD series
    • FYWK .. Y and FYTWK .. Y series
    • FYWR and FYTWR series
  • JIS B 1559:2009
    • FYJ, FYTJ and FYC series
    • FYWK .. L and FYTWK .. L series
  •  no standard (neither national nor international), but common in the marketplace
    • FYAWK series
Bearing data
TolerancesTotal width T (fig. 1):
  • d ≤ 50 mm
    → ±0,5 mm
  • d > 50 mm
    → ±0,6 mm

The outside diameter of the bearing is matched to it's seat in the housing so that the outer ring is prevented from turning, but still able to compensate for misalignment.

Bearing data
Radial internal clearanceBearing data
Materials

Cast iron

  • FY(J), FYT(J), FYTB and FYC series
    • grey cast iron EN-GJL-HB235 in accordance with EN 1561:2011

Composite

  • FYK and FYTBK series
    • glass fibre reinforced PA6
    • "moulded in" steel coil reinforcement

Pressed steel

  • PFT, PF and PFD series
    • cold-rolled sheet steel, chromium6+ free zinc-coated

Composite for SKF Food Line

  • FYWK .. Y and FYTWK .. Y series
    • glass fibre reinforced PA6
    • "moulded in" steel coil reinforcement
  • FYWK .. L, FYTWK .. L and FYAWK .. L series
    • glass fibre reinforced PBT

Stainless steel

  • FYWR and FYTWR series
    • cast austenitic stainless steel (AISI 300 series)
Materials for rolling bearings
MisalignmentBearing data
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