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SKF
Self-Aligning Ball B. SKF 1209 EKTN9/C3
- Technical data
- Inner diameter
- 45 mm
- Outer diameter
- 85 mm
- Width
- 19 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
- Tapered bore (1:12)
- Inner ring
- Standard version
- Temperature range
- -30 to +120 °C
- Weight
- 0,47 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 2,01 € | 38,14 € |
| 35 | 4,01 € | 36,14 € |
Self-Aligning Ball B. SKF 1209 EKTN9/C3
The SKF 1209 EKTN9/C3 spherical ball bearing, with its hollow-spherical outer ring raceway, compensates for misalignment with a 45 mm bore and an 85 mm outer diameter.
The double-row 1209 EKTN9/C3 self-aligning ball bearing from SKF Rolling Bearings accommodates radial loads and tolerates misalignment between the inner and outer rings. Manufactured from standard roller bearing steel (100Cr6), this open roller bearing has a width of 19 mm. This design combines a tapered bore with a lightweight polyamide cage and is suitable for operating temperatures ranging from –30 to +120 degrees Celsius.
What is the 1209 EKTN9/C3 self-aligning ball bearing suitable for in operation?
Design engineers primarily select the 1209 EKTN9/C3 self-aligning ball bearing for applications where shaft deflection or misalignment may occur. Thanks to the shared hollow spherical raceway in the outer ring, the two rows of balls adjust flexibly during operation. Typical applications include long shafts and general industrial assemblies with misalignment. As the bearing is of an open design, the lubricant reaches the rolling elements unhindered.
What are the characteristics of a tapered bore and C3 clearance?
The version with the suffix ‘K’ has a tapered bore with a 1:12 taper. This design allows direct mounting on a tapered shaft seat or, using a collet, on a smooth shaft. During press-fitting, the radial bearing clearance is reduced. The C3 bearing clearance rating compensates for this displacement effect, ensuring that the correct operating clearance remains after installation. The polyamide cage contributes to quiet ball circulation.
What are the dimensions of the 1209 EKTN9/C3 self-aligning ball bearing?
This roller bearing has a bore of 45 mm, an outside diameter of 85 mm and a width of 19 mm. These dimensions correspond to the standardised main dimensions for self-aligning ball bearings of this size.
What does the suffix ‘K’ mean in the designation of the 1209 self-aligning ball bearing?
The designation letter K stands for a tapered or conical internal bore with a ratio of 1:12. This design is usually fitted in conjunction with a clamping or withdrawal sleeve, which facilitates mounting on solid cylindrical shafts.
Why does this bearing have a bearing clearance class of C3?
Class C3 denotes a slightly increased radial bearing clearance compared with the standard version. As the inner ring expands when slid axially onto a tapered seat and the bearing clearance decreases, the increased initial clearance ensures that the bearing continues to run smoothly.
What are the features of the TN9 polyamide cage?
The abbreviation TN9 denotes a polyamide cage. This cage is lightweight, reduces running noise and is designed for the specified temperature range of -30 to +120 degrees Celsius.
How is the 1209 EKTN9/C3 open pendulum ball bearing lubricated?
As the bearing is designed without integrated sealing washers, lubrication is provided by the surrounding housing structure. Depending on the speed and operating conditions, the bearing can be operated using either grease or oil and must be sealed externally.
What is the bearing’s tolerance class?
The bearing complies with tolerance class P0 or PN, which corresponds to the ABEC 1 standard tolerance. This design offers dimensional and running accuracy that meets the general requirements of standard mechanical engineering.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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