Designs

Housings

SKF roller bearing units are available in four non-split plummer block housing series:
  • metric SKF ConCentra units in the SYNT series (fig 1)
  • inch SKF ConCentra units in the SYE .. N and SYR .. N series (fig 2)
  • units with a locking collar in the SYE and SYR series (fig 3)
Plummer block housings in the SYNT series have a stiff design that helps the housing to retain its form. These non-split, grey cast iron housings have the same excellent heat conducting properties and strength as comparably sized SKF split SNL plummer block housings.
Housings in the SYNT series have two holes cast into the base for attachment bolts. The area around the holes is strengthened to minimize the risk of cracking caused by possible over-tightening of the attachment bolts. Centre lines and dimples cast into the housing base facilitate mounting (fig 4). The ribs in the base help strengthen it and also enable good heat dissipation, while providing a solid flat surface for shims (fig 5).
Housings in the SYE and SYR series are made of grey cast iron and have two holes cast into the base for attachment bolts. Those in the FSYE series (SYE series with a designation prefix F) have four holes cast into the base.

Locating and non-locating units

All SKF plummer block roller bearing units are available as:
  • locating bearing units (fig 6)
  • non-locating bearing units (fig 7)
Additional information is provided in the section Locating and non-locating units.

Location on the shaft

SKF roller bearing units are located on the shaft in two different ways:
  • with concentric locking via a stepped sleeve (fig 8) for SKF ConCentra units
  • with locking collar attachment (fig 9) for all other units
Additional information about the two types of location is provided in the section Location on the shaft.

Seals

Metric SKF ConCentra units with a plummer block housing are produced as standard with:
Inch SKF ConCentra units are produced as standard with:
Units with a locking collar are produced as standard with:
On request, these units can be supplied with:
Information about the seal designs is provided in the section Seals.

End covers

End covers are available for plummer block roller bearing units fitted at shaft ends:
  • For SKF ConCentra units in the SYNT series the end covers are made of plastic, for the time being available for sizes 35 to 75 (fig 18).
  • For units with a locking collar, the end covers are made of sheet steel (fig 19).
Additional information is provided in the section End covers.