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SKF
Cylindrical Roller Bearings SKF NJ2311 ECP/C3
- Technical data
- Inner diameter
- 55 mm
- Outer diameter
- 120 mm
- Width
- 43 mm
- Roller rows
- Single row bearing
- Seal
- None, open bearing
- Cage
- Polyamide cage
- Clearance
- Slightly increased radial clearance
- Running accuracy
- Dimensional accuracy P0/PN or ABEC 1, running accuracy P6 or ABEC 3
- Current insulation
- No current insulation
- Bore
- Cylindrical bore
- Outer ring
- Without groove/lubrication holes
- Version2
- Improved interior construction
- Design
- Support bearing (axial displacement), inner ring removable on one side
- Temperature range
- -30 to +120 °C
- Weight
- 2,259 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 10 | 8,25 € | 156,76 € |
| 20 | 16,49 € | 148,52 € |
Cylindrical Roller Bearings SKF NJ2311 ECP/C3
The SKF NJ2311 ECP/C3 cylindrical roller bearing combines an optimised internal design with a polyamide cage and C3 clearance, with dimensions of 55 x 120 x 43 mm.
The NJ2311 ECP/C3 cylindrical roller bearing is a single-row radial roller bearing designed for demanding industrial applications involving high radial loads. With a bore of 55 mm, an outside diameter of 120 mm and a width of 43 mm, this component is suitable as a precisely fitting machine element for engineering and maintenance. This open bearing from SKF features an optimised internal design and guides the rollers evenly. With dimensional accuracy to P0 (ABEC 1) and increased running accuracy to P6 (ABEC 3), the component fits precisely into defined guidance systems.
What is the NJ2311 ECP/C3 cylindrical roller bearing suitable for in operation?
The NJ design is primarily used where high radial forces occur and axial fixation in one direction is required. As a support bearing, the design absorbs axial forces in one direction via the single-sided flange of the inner ring, whilst allowing axial displacement in the opposite direction. Such requirements arise in the case of mounted shafts subject to thermal length changes. The inner ring can be removed from one side, which simplifies the separate assembly of the inner and outer rings.
What does the design with C3 bearing clearance and a polyamide cage mean?
The C3 designation indicates a slightly increased radial clearance compared with the standard version. This increased clearance compensates for thermal expansion when temperature differences arise between the shaft and housing during operation, or when tight fits are selected. The integrated polyamide cage guides the cylindrical rollers with low friction and vibration damping. When designing the system, please note the permissible temperature range of -30 to +120 degrees. As this is an open bearing without a groove or lubrication bore on the outer ring, an external lubricant supply must be provided.
What are the distinctive features of the NJ design in the NJ2311 ECP/C3 cylindrical roller bearing?
The NJ design features two fixed flanges on the outer ring and one fixed flange on the inner ring. This enables the bearing to function as a support bearing: it accommodates radial loads and unilateral axial forces. As the inner ring can be removed from one side, the inner and outer rings can be mounted on the shaft and housing independently of one another.
What are the dimensions of the NJ2311 ECP/C3 cylindrical roller bearing?
The bearing has a bore diameter of 55 mm, an outer diameter of 120 mm and a width of 43 mm. The outer ring is smooth and has no ring groove or lubrication hole. Grease or lubricating oil must therefore be supplied to the roller set via the housing design from the end face.
When is the increased clearance (C3) required for this bearing?
The version with C3 bearing clearance offers greater radial operating clearance than a standard bearing. It is selected when operational heating leads to temperature differences between the shaft and the housing, or when tight fits reduce the bearing clearance. The increased bearing clearance prevents the rolling elements from jamming and promotes smooth running.
What are the characteristics of the polyamide cage in the NJ2311 ECP/C3?
The polyamide cage, designated with the suffix ECP, is lightweight and dampens vibrations during operation. It guides the rollers with low friction and precision. The cage is designed for the specified temperature range of -30 to +120 degrees and is compatible with standard mineral oil-based greases and oils.
How is the NJ2311 ECP/C3 open cylindrical roller bearing lubricated and sealed?
As an open roller bearing, the NJ2311 has no integrated seals. Protection against dirt and moisture is provided by the surrounding machine housing, for example by means of radial shaft seals. Grease or oil is applied directly into the roller chamber via the end faces on the sides.
What is the tolerance class of this SKF cylindrical roller bearing?
The bearing combines dimensional accuracy to Class P0 (ABEC 1) with increased running accuracy to Class P6 (ABEC 3). This ensures that standardised fit dimensions are maintained, whilst the tighter tolerance on running accuracy contributes to precise guidance of the rotating shaft during operation.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
10002618