Housing designs

SKF flanged housings for insert 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 the 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 chromium ⁶⁺ 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 the SKF Food Line
- F4BC series (square flange)
  → four round bolt holes
- F2BC series (oval flange)
  → two round bolt holes
- F3BBC series (3-bolt bracket flange)
  → three round bolt holes
Bolt holes are reinforced with austenitic stainless steel inserts.
Stainless steel
- F4BSS series (square flange)
  → four round bolt holes
- F2BSS 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.