Cookies on the SKF website

We use cookies to ensure that we give you the best experience on our websites and web applications. By continuing without changing your browser settings, we assume you give your consent to receive cookies. However, you can change your browser cookie setting at any time.

Designs and variants

The SKF standard assortment of four-row cylindrical roller bearings (fig. 1) includes bearings with a cylindrical or tapered bore, as well as open and sealed designs.
Basic design bearings

SKF basic design four-row cylindrical roller bearings are available in several designs. The major design differences between the bearings are the number of inner and outer rings, the ring designs (flange configurations), and the cage design and material. The most popular bearing designs are:

Bearing designRing and flange designCage design
BC4.1 design
  • two outer rings
    • each with three integral flanges
  • one inner ring
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.1 design
  • two outer rings
    • each with three integral flanges
  • one inner ring
    • tapered bore
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.2 design
  • two outer rings
    • each with three integral flanges
    • intermediate ring in between
  • one inner ring
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.2 design
  • two outer rings
    • each with three integral flanges
    • intermediate ring in between
  • one inner ring
    • tapered bore
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.3 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • one inner ring
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.3 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • one inner ring
    • tapered bore
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.4 design
  • two outer rings
    • each with two integral flanges
  • one inner ring
    • no flanges
  • two cages
  • machined brass
  • window-type
  • roller centred
BC4T.4 design
  • one outer ring
    • two flange rings
    • three guide rings
  • one inner ring
    • tapered bore
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.5 design
  • one outer ring
    • two flange rings
    • three guide rings
  • one inner ring
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.5 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • one inner ring
    • tapered bore
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.6 design
  • one outer ring
    • five integral flanges
  • one inner ring
    • no flanges
  • four cages
  • machined brass or steel
  • prong-type
  • roller centred
BC4T.6 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • tapered bore
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.7 design
  • two outer rings
    • each with three integral flanges
  • two inner rings
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.7 design
  • two outer rings
    • each with three integral flanges
  • one inner ring
    • tapered bore
    • extended on one side
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.8 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4T.8 design
  • one outer ring
    • two flange rings
    • three guide rings
  • one inner ring
    • tapered bore
    • extended on one side with a lead-in taper
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.9 design
  • two outer rings
    • each with three integral flanges
  • two inner rings
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.10 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.11 design
  • two single row and one double row outer rings
    • two intermediate rings in between
    • each single row ring with an integral flange
    • double row ring with an integral central flange
  • two inner rings
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.12 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • no flanges
  • four cages
  • stamped steel
  • window-type
  • roller centred
BC4.13 design
  • two outer rings
    • each with two integral flanges
  • two inner rings
    • no flanges
  • two cages
  • machined brass
  • window-type
  • roller centred
BC4.14 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • four inner rings
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.15 design
  • two outer rings
    • no flanges
  • two inner rings
    • each with three integral flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.16 design
  • one outer ring
    • two flange rings
    • three guide rings
  • one inner ring
    • extended on one side
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.17 design
  • two outer rings
    • each with three integral flanges
  • two inner rings
    • one ring extended on one side
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.18 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • one ring extended on one side
    • no flanges
  • two cages
  • machined brass or steel
  • double prong-type
  • roller centred
BC4.19 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • one ring extended on one side
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.20 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • one ring extended on one side with a concentric shoulder
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
BC4.21 design
  • two outer rings
    • each with an integral central flange
    • intermediate ring in between
    • two flange rings
  • two inner rings
    • each extended on one side
    • one ring with a concentric shoulder
    • one ring with a lead-in taper
    • no flanges
  • four cages
  • machined steel
  • pin-type
  • pierced rollers
Sealed bearings
  • are fitted with a spring loaded, double-lip radial shaft seal, which is:
    • made of HNBR
    • anchored in a recess on the flange ring
    • sealing against the inner ring raceway
  • accommmodate speeds limited by the permissible circumferential speed of the seal (25 m/s)
  • are available sealed on one or both sides (BC4.23 or BC4.22 design)
    Bearing designRing and flange designCage design
    BC4.22 design
    • two outer rings
      • each with an integral central flange
      • intermediate ring in between
      • two flange rings
    • two inner rings
      • each with an integral flange
    • four cages
    • stamped steel
    • window-type
    • roller centred
    BC4.23 design
    • two outer rings
      • each with an integral central flange
      • intermediate ring in between
      • two flange rings
    • two inner rings
      • each with an integral flange
    • four cages
    • stamped steel
    • window-type
    • roller centred
Variants/features

Where four-row cylindrical roller bearings are to be mounted with a loose fit on the shaft or roll neck (e.g. to allow rapid roll changes) they can be supplied with one or more additional features (fig. 2) to compensate for disadvantages of the loose fit. The helical groove in the bore and/or lubrication grooves in the side faces of the bearing rings enable effective lubrication to be provided for the sliding contact surfaces.

Bearings equipped with one or more of these features are identified in the Design variant/feature (→ product table) as described in the following:

GHelical groove in inner ring(s) bore
WLubrication grooves in the side faces of the bearing rings
WILubrication grooves in the side faces of the inner ring(s)
WOLubrication grooves in the side faces of the outer ring(s)
W20
Lubrication holes in outer ring(s)
W33Annular groove and lubrication holes in outer ring(s)
Cages

SKF four-row cylindrical roller bearings are fitted with two or four of the cages shown in table 1.

For information about the suitability of cages, refer to Cages and Cage materials.

SKF logo