Designs and variants
SKF standard assortment
basic design bearings with cylindrical or tapered bore
- taper 1:12 (designation suffix K)
- taper 1:30 (designation suffix K30)
- sealed bearings
Depending on their series and size the following open CARB toroidal roller bearings are available as standard:
- bearings with a roller centred cage (fig. 1)
- bearings with an inner ring centred cage (fig. 2)
- full complement bearings with a retaining ring (fig. 3)
The load carrying capacity of full complement CARB bearings is considerably higher than that of same-sized bearings with a cage.
- are available, as standard, as small and medium-size full complement bearings with a cylindrical bore
- are typically used for low speeds and very heavy loads
- are suitable for both inner or outer ring rotation
- are fitted with a double-lip contact seal on one or both sides in a recess on the outer ring, sealing against the inner ring raceway
- are available with two different seal materials / designs:
Bearings sealed on both sides are lubricated for the life of the bearing and are virtually maintenance-free. They are filled with one of the following greases:
- bearings with HNBR seals → SKF LGHB 2 grease as standard (table 1)
- bearings with NBR seals → SKF LGEP 2 grease as standard (table 1)
- other SKF greases on request
For additional information about greases → Selecting a suitable SKF grease.
CARB bearings, if not full a complement of rollers, are fitted with one of the following cages:
- glass fibre reinforced PA46 cage, window-type, roller centred (designation suffix TN9)
- stamped steel cage, window-type, roller centred (no designation suffix)
- machined brass cage, window-type, roller centred (designation suffix M)
- machined brass cage, inner ring centred (designation suffix MB)
When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages.
- paper mills or coaters in high precision execution
- very arduous operating conditions, e.g. continuous casters
- high temperature applications
For additional information about application-specific CARB bearings, contact the SKF application engineering service.