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Housing designs

SKF flanged housings for Y-bearings are available as standard in a wide variety of designs and materials. The standard assortment includes housings made of:
  • cast iron
  • composite
  • pressed steel
  • composite for SKF Food Line
  • stainless steel

Attaching to a support surface

Flanged housings have two, three or four bolt holes through which they can be attached to a support surface with threaded fasteners. The bolt holes vary for different housing designs and materials:
  • Cast iron
    • FY(J) series (square flange)
      → four round bolt holes
    • FYT(B) and FYTJ series (oval flange)
      → two round bolt holes
    • FYC series (round flange)
      → four round bolt holes
  • Composite
    • FYK series (square flange)
      → four round bolt holes
    • FYTBK series (oval flange)
      → two round bolt holes
    Bolt holes are reinforced with chromium6+ free zinc-coated steel inserts.
  • Pressed steel
    • PFT series (oval flange)
      → two square bolt holes
    • PF and PFD series (round and triangular flange)
      → three or four square bolt holes
  • Composite for SKF Food Line
    • FYWK series (square flange)
      → four round bolt holes
    • FYTWK series (oval flange)
      → two round bolt holes
    • FYAWK series (3-bolt bracket flange)
      → three round bolt holes
    Bolt holes are reinforced with austenitic stainless steel inserts.
  • Stainless steel
    • FYWR series (square flange)
      → four round bolt holes
    • FYTWR series (oval flange)
      → two round bolt holes
Depending on the design flanged housings may have a centring recess (fig. 1), or a centring shoulder (fig. 2) at the back for accurate positioning, either on an appropriate shoulder or in a bore in the machine wall. Housings in the series FY .. M, FYJ, FYTB .. M, FYTJ, FYK and FYTBK have a centring recess while FYC housings do have a centring shoulder. For dimensions and tolerances, refer to the relevant product tables.

An appropriate shoulder can be provided by one of the following methods:

  • machining the wall accordingly (fig. 3)
  • attaching an appropriate washer to the wall by several screws (fig. 4)

Furthermore, these features relieve the attachment bolts of radial forces.

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