C2208-KTN9 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the C2208-KTN9 model number is decoded

For long shafts that grow thermally, SKF supplies C 2208 KTN9: the toroidal rollers allow the 40 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 2208 KTN9 separates into C (CARB), 22 (dimension series), 08 (40 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 40×80×23 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 40 mm shaft deflects; the 8,000 r/min reference and 11,000 r/min limiting speed are both catalogue values. The 510 g mass over the 40×80×23 mm envelope yields about 2.25 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 23 mm wide cavity does not fill itself.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 40 mm bore the small CARB executions are unusually wide (23 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.
• Reference and limiting speeds are different limits: the 8,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.
• The quoted 90/86.5 kN ratings belong to this exact execution (C 2208 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
• Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.
• Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2208 KTN9 must float; the two are designed to be used as a pair.
• The 90/86.5 kN ratings and 510 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only.