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SKF
Self-Aligning Ball B. SKF 1311 EKTN9/C3
- Technical data
- Inner diameter
- 55 mm
- Outer diameter
- 120 mm
- Width
- 29 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
- 1,6 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 15 | 4,09 € | 77,72 € |
| 30 | 8,19 € | 73,62 € |
Self-Aligning Ball B. SKF 1311 EKTN9/C3
The SKF 1311 EKTN9/C3 double-row self-aligning ball bearing, measuring 55x120x29 mm, compensates for misalignment via its hollow-spherical outer ring raceway.
With the 1311 EKTN9/C3 self-aligning ball bearing, you are choosing an open, double-row rolling bearing for demanding industrial applications. The component is made from standard rolling bearing steel (100Cr6) and accommodates misalignment between the inner and outer rings. Fitted with a lightweight polyamide cage and featuring tolerance class P0/PN (ABEC 1), this model is suitable for operating temperatures ranging from -30 to +120 degrees Celsius.
What is the 1311 EKTN9/C3 self-aligning ball bearing suitable for?
This bearing is primarily used where elastic shaft deflection or misalignment between bearing positions occurs. Typical applications include long shaft runs, conveyor systems and general mechanical engineering. The double-row ball design accommodates radial loads. As this is an open design without an integrated seal, the lubricant can be flexibly adapted to the environmental conditions of the respective system.
What are the advantages of a tapered bore and C3 clearance?
The combination of a tapered bore (1:12 taper) and increased radial clearance (C3) facilitates mounting on clamping or withdrawal sleeves. When pressed onto the tapered seat, the operating clearance is measurably reduced, whereby the C3 bearing clearance counteracts the rolling elements becoming jammed. This clearance also accommodates thermal expansion at operating temperatures of up to +120 degrees, whilst the polyamide cage ensures low-vibration operation.
What are the dimensions of the 1311 EKTN9/C3 self-aligning ball bearing?
The dimensions are 55 mm bore diameter, 120 mm outside diameter and 29 mm width. These geometric values determine the installation space required within the housing and on the shaft, and must be taken into account when designing the bearing mounting.
What does the suffix EKTN9/C3 mean for this bearing?
The suffix indicates key design features: ‘K’ denotes the tapered internal bore with a taper ratio of 1:12. TN9 stands for the injection-moulded polyamide cage, and C3 indicates a slightly increased radial bearing clearance to accommodate temperature effects or reduced fits.
How is a self-aligning ball bearing with a tapered bore fitted?
Bearings with a tapered inner ring can be mounted either directly onto a tapered shaft journal or onto cylindrical shafts using a mounting or withdrawal sleeve. As the bearing is pushed onto the shaft axially, the radial bearing clearance decreases gradually. Installation therefore requires careful monitoring of the remaining bearing clearance.
Why does the bearing not have integrated seals?
As an open-type bearing, it is designed for applications in which the lubricant is supplied via an external housing system, for example through an oil bath or a centralised lubrication system. The absence of abrasive sealing lips reduces friction losses and allows for easy relubrication at regular maintenance intervals.
Within what temperature range is the component permitted to operate?
The permissible temperature range is between -30 and +120 degrees Celsius. The upper temperature limit is largely determined by the polyamide cage, the material structure of which remains elastic and dimensionally stable within this range. This temperature range must also be observed when selecting the grease or oil.
How does the angular contact ball bearing compensate for angular misalignment?
The outer ring features a continuous, hollow spherical raceway along which the two rows of balls move together. Thanks to this spherical geometry, the inner bearing assembly – comprising the inner ring and shaft – can tilt continuously within the outer ring. As a result, misalignment or shaft deflection do not lead to angular constraints.
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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