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SKF
Cylindrical Roller Bearings SKF NU313 ECP
- Technical data
- Inner diameter
- 65 mm
- Outer diameter
- 140 mm
- Width
- 33 mm
- Roller rows
- Single row bearing
- Seal
- None, open bearing
- Cage
- Polyamide cage
- Clearance
- Normal 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
- Floating bearing, inner ring removable on both sides
- Temperature range
- -30 to +120 °C
- Version
- Explorer
- Weight
- 2,2 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 10 | 5,97 € | 113,45 € |
| 20 | 11,94 € | 107,48 € |
Cylindrical Roller Bearings SKF NU313 ECP
The SKF NU313 ECP cylindrical roller bearing is a separable non-locating bearing with dimensions of 65 × 140 × 33 mm, designed primarily for radial loads.
The NU313 ECP cylindrical roller bearing is designed to support shafts under purely radial loads. In the SKF Explorer version, this single-row roller bearing features an optimised internal design. The inner ring, which can be removed from both ends, allows the inner and outer rings to be fitted separately. Thanks to its standard radial clearance, the roller bearing is suitable for standard operating conditions without excessive heating or tight fits.
What function does the NU313 ECP cylindrical roller bearing fulfil as a non-locating bearing?
When used purely as a non-locating bearing, the NU313 ECP cylindrical roller bearing compensates for operational axial displacements of the shaft directly between the raceways without any constraint. As the inner ring has no flange, the rolling elements move unhindered on the inner raceway during thermal expansion. Thanks to its open design, which has no sealing washers and no lubrication groove in the outer ring, the bearing can be integrated directly into an external lubrication system.
What are the key features of the polyamide cage in the ECP variant?
The integrated polyamide cage guides the rollers whilst being lightweight and effectively dampens movements within the rolling element set. The material is designed for an operating temperature range of –30 to +120 degrees and contributes to quiet operation. The combination of P0 dimensional accuracy (ABEC 1) and P6 running accuracy (ABEC 3) promotes precise running characteristics in demanding shaft bearings.
What are the distinctive features of the NU313 ECP cylindrical roller bearing design?
The NU design features two fixed flanges on the outer ring, whilst the inner ring is flangeless. This allows the inner ring to be removed from either side, which simplifies separate installation. At the same time, the design acts as a floating bearing, allowing the shaft to move axially within the bearing in the event of thermal expansion.
What are the dimensions of the NU313 ECP cylindrical roller bearing?
This roller bearing has a cylindrical bore with an internal diameter of 65 mm, an external diameter of 140 mm and a width of 33 mm. These dimensions comply with standardised series for cylindrical roller bearings. They allow for direct replacement in standardised bearing housings and on suitably machined shaft bearing seats used in industry.
What does the suffix ‘ECP’ mean in relation to this bearing?
The suffix ‘ECP’ refers to the series’ optimised internal design and its polyamide cage. This combination offers favourable running characteristics with reduced friction. The polyamide material keeps the weight of the roller guide low and ensures quiet operation under radial loads.
What is the operating temperature range for this bearing?
The permissible temperature range for this version is between -30 and +120 degrees. This range is primarily limited by the polyamide material of the cage. Within this temperature range, the cage retains its dimensional stability and mechanical strength, provided that the lubricant used is approved for the same temperature range.
How is the NU313 ECP open cylindrical roller bearing lubricated?
As the component is designed as an open bearing, it does not have any factory-fitted sealing washers. Furthermore, the outer ring has neither a lubrication groove nor a relubrication bore. The supply of lubricant – either oil or rolling-bearing grease – is provided via the open space in the surrounding structure, which must also act as a seal against dirt and moisture.
What is the bearing’s tolerance class?
The model combines dimensional accuracy to P0 or ABEC 1 with increased running accuracy of class P6 or ABEC 3. The main dimensions therefore comply with common standard tolerances for fits, whilst the tighter P6 running tolerance promotes low radial runout and improved synchronisation characteristics of the rolling elements.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
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