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SKF
Self-Aligning Ball B. SKF 2208 ETN9/C3
- Technical data
- Inner diameter
- 40 mm
- Outer diameter
- 80 mm
- Width
- 23 mm
- Material
- Standard bearing steel
- Ball rows
- Double row bearing
- Seal
- None, open bearing
- Cage
- Polyamide cage
- Clearance
- Slightly increased radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Bore
- Cylindrical bore
- Inner ring
- Standard version
- Temperature range
- -30 to +120 °C
- Weight
- 0,51 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 2,42 € | 45,92 € |
| 35 | 4,83 € | 43,51 € |
Self-Aligning Ball B. SKF 2208 ETN9/C3
The SKF 2208 ETN9/C3 self-aligning ball bearing, measuring 40x80x23 mm and featuring a C3 clearance, compensates for misalignment caused by shaft deflection during operation.
The 2208 ETN9/C3 self-aligning ball bearing is a double-row rolling bearing made from standard bearing steel (100Cr6) with a 40 mm cylindrical bore. The manufacturer, SKF, produces this open bearing for applications where shafts deflect elastically or misalignment occurs between bearing locations. Thanks to the shared hollow spherical raceway in the outer ring, the inner ring and ball cages pivot flexibly during operation. The combination of a polyamide cage and the slightly increased radial clearance (C3) ensures smooth running in demanding industrial machinery.
What is the 2208 ETN9/C3 self-aligning ball bearing suitable for?
This double-row bearing is ideal for industrial shaft mountings where shaft deflection or misalignment of the housing mounting needs to be compensated for. Thanks to its open design, lubricant can be applied directly via the housing. The version with a polyamide cage allows operating temperatures ranging from -30 to +120 degrees Celsius. Workshop managers and maintenance engineers appreciate its ease of handling during repairs. Furthermore, the dimensions comply with the standardised tolerance class P0/PN or ABEC 1 for standardised industrial use.
What are the advantages of the polyamide cage and the C3 bearing clearance?
The lightweight polyamide cage (suffix ETN9) dampens vibrations and reduces frictional forces in the ball raceway. The C3 designation indicates a slightly increased radial bearing clearance, i.e. greater radial play prior to installation. This additional clearance prevents the bearing from becoming stressed due to heating during operation or as a result of tight fits on the shaft and housing. Before assembly, check the mounting dimensions – 40 mm shaft diameter, 80 mm outer ring and 23 mm width – as well as the on-site lubrication supply.
What are the dimensions of the 2208 ETN9/C3 self-aligning ball bearing?
This roller bearing has a cylindrical bore of 40 mm, an outer diameter of 80 mm and a width across flats of 23 mm. These dimensions comply with the standardised main dimensions for double-row self-aligning ball bearings of this size and allow for a precise fit when installed in housings and on shafts with the appropriate dimensional accuracy.
What does the suffix ETN9 mean for this bearing?
The designation ETN9 indicates a polyamide cage. This cage material is characterised by its low weight, good sliding properties and elastic behaviour. In combination with 100Cr6 rolling bearing steel, the bearing operates within a temperature range of -30 to +120 degrees Celsius and ensures smooth, low-friction operation of the rolling elements.
Why is the C3 clearance important in the 2208 self-aligning ball bearing?
The designation C3 indicates a slightly increased radial bearing clearance compared with the standard version. This additional operating clearance compensates for operational thermal expansion of the shaft or housing and prevents premature bearing seizure. Particularly in the event of rapid temperature rises or tight fits, the C3 clearance ensures that the bearing runs safely and without fault.
How does the self-aligning ball bearing compensate for angular misalignment and shaft deflection?
The two rows of balls in the inner ring run in a common hollow-spherical raceway in the outer ring. This allows the inner ring, together with the balls, to tilt relative to the outer ring during operation. This design automatically compensates for misalignment between bearing seats or deflection in long shafts without causing additional friction or forcing forces.
What type of lubrication does the 2208 ETN9/C3 open spherical roller bearing require?
As this bearing is designed without integrated seals, lubrication must be provided via the surrounding housing structure. You can use lubricating greases or oils, depending on the operating conditions and speeds. Ensure that the installation environment is clean and that external seals are fitted to the housing to prevent dirt particles from entering the open raceways.
What is the bearing’s tolerance class?
The bearing is manufactured to the standard tolerance class P0/PN, which corresponds to the ABEC 1 classification. This standard tolerance meets the requirements of general mechanical engineering and ensures a precise fit on the shaft and within the housing. For maintenance engineers and designers, this means straightforward integration without the need for special dimensions.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
10020079