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SKF
Cylindrical Roller Bearings SKF NU311 ECP
- Technical data
- Inner diameter
- 55 mm
- Outer diameter
- 120 mm
- Width
- 29 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
- 1,435 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 10 | 5,57 € | 105,89 € |
| 20 | 11,15 € | 100,31 € |
Cylindrical Roller Bearings SKF NU311 ECP
The SKF NU311 ECP cylindrical roller bearing, designed as a free end bearing with a 55 mm bore and an outer diameter of 120 mm, can accommodate high radial loads.
The SKF NU311 ECP single-row cylindrical roller bearing is characterised by its optimised internal design in the Explorer version. With dimensions of a 55 mm bore, 120 mm outer diameter and 29 mm width, this bearing accommodates high radial loads. The integrated polyamide cage guides the rolling elements with low vibration and reduced noise. As an open design without abiding sealing elements, the roller bearing is designed for external lubrication systems using oil or grease.
What functions does the NU311 ECP cylindrical roller bearing perform as a non-locating bearing?
This roller bearing functions as a floating bearing in rotating systems. As the inner ring is flangeless on both sides and removable, the bearing compensates purely axially and without constraint for operational length changes of the shaft relative to the housing. Typical applications include bearing arrangements subject to high radial loads, where the shaft is axially guided by a separate fixed bearing.
When is the polyamide cage in the NU311 ECP the right choice?
The polyamide cage keeps the weight of the rolling element set low and promotes smooth running behaviour during rapid acceleration. This cage material is designed for an operating temperature range of -30 to +120 degrees. Thanks to the separate installation of the inner and outer rings, fitting is practical for both installation and maintenance when there are tight fits on the shaft and housing bore.
What is the function of the NU design in the NU311 ECP cylindrical roller bearing?
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, defining the bearing as a pure support bearing. It compensates for axial shaft expansion without inducing stress within the bearing.
What are the dimensions of the roller bearing?
The bearing has an inside diameter of 55 mm, an outside diameter of 120 mm and a width across flats of 29 mm. These standardised key dimensions facilitate standardised replacement in existing housing and shaft fits.
What does the suffix ‘ECP’ mean at SKF?
The abbreviation ECP denotes an optimised internal design for increased load-bearing capacity, as well as a polyamide cage. This cage material reduces friction and weight compared with solid metal cages.
What is the operating temperature range of the NU311 ECP cylindrical roller bearing?
The bearing is designed for continuous operation at temperatures between -30 and +120 degrees. The upper limit is largely determined by the polyamide cage, which is why the lubricant should be thermally suited to this operating range.
What tolerance classes apply to dimensional and running accuracy?
The bearing has standard accuracy P0 or standard tolerance (PN, comparable to ABEC 1) for its external dimensions. The running accuracy of the rotating components corresponds to the higher precision grade P6 or ABEC 3, which ensures smooth concentricity.
Does the open bearing need to be lubricated before commissioning?
Yes, as this is an open bearing without integrated seals, a suitable lubricant must be applied before start-up. Depending on the design of the connecting components, lubrication is carried out using grease or a connected oil circulation system.
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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