NSK NU2311E cylindrical roller bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
- Series
- NU
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Decoding NSK NU2311E
- NU 23Series
- Cylindrical roller bearings, NU 23 series. Series differ in outside diameter and width even when the bore is the same.
- 11Bore
- Bore 55 mm (11 × 5).
- ESuffix
- NSK suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NU 2311 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK NU2311E measures 55 mm across the bore and 120 mm across the outside diameter; its width is 43 mm (55 x 120 x 43 mm).
NSK NU2311E belongs to cylindrical roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for NU2311E and any equivalents.
A cylindrical roller bearing from the NSK NU E series separates into two pieces: the outer ring carries flanges, the inner ring does not. Running with this arrangement, the bearing takes high radial loads while the shaft is free to shift axially inside the housing. Gearboxes, pumps, fans and machine tools are typical places where that freedom is needed, whether for thermal growth or for easier assembly.
Reading the code is straightforward. NU tells you the inner ring is flangeless and the bearing separates; the digits in the middle are the dimension code; the trailing E marks the execution with a polyamide cage. Codes such as NU220E, NU317E and NU2220E follow the same pattern, so a different number means a different size, not a different design.
Because the inner ring has no flanges, axial movement of the shaft is possible and thermal expansion does not create extra loads. This is why the bearing often sits on the side of an assembly where the opposite support already holds the axial position. Centrifugal pumps, industrial fans, compressors, gear units, machine tools and transmission equipment are common applications.
Selection comes down to radial load, speed, cage type and how the assembly is sealed. At mounting, the inner ring goes on the shaft and the outer ring into the housing. Check alignment between the supports, then lubricate with the grease or oil quantity and type that match the operating conditions. Poor alignment or too little lubrication will cut service life.
Interchange across brands works by dimension code and execution: an NU from another maker's E series fits if bore, width and flange arrangement are the same. If you have an unidentified part or a code from another brand, send it over and the compatible reference will be confirmed before quoting.
To get a quote on an NSK NU E series cylindrical roller bearing, message the complete code or the shaft and housing dimensions. The team replies promptly and points out a compatible alternative where one applies.
Dimensions
55 x 120 x 43 mm (d x D x B): boundary dimensions for basic designation NU 2311, according to ISO 15.
- Bore
- 55 mm
- Outside diameter (D)
- 120mm
- Width (B)
- 43mm
SKF and other brands, same size
Other brands' pages with basic designation NU 2311: 55 x 120 x 43 mm (d x D x B) per ISO 15.
- Need the SKF NU 2311? We can also quote:NU 2311 ECPNU 2311 ECMLNU 2311 ECP/C32 more →
- FAGNU2311-E-XL-TVP2
- NTNNU2311NU2311EA
- RKBNU 2311
What they share are the ISO 15 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- NSK NU2311E bearing: what are its dimensions?
- NSK NU2311E measures 55 mm across the bore and 120 mm across the outside diameter; its width is 43 mm (55 x 120 x 43 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NU 2311.
- What does the E mean in an NU E bearing?
- It identifies the execution with a polyamide cage inside the NU series. The number before it sets the bearing dimensions. Send the complete code to confirm the exact reference.
- How do I choose between an NU and another cylindrical roller bearing type?
- It depends on whether the shaft has to move axially and which support fixes the position. NU, with its flangeless inner ring, allows that movement. Share the application and load so the choice can be guided.
- Can an NU from another brand be replaced with an NSK one?
- Yes, when dimensions and flange configuration match. Equivalence follows the dimension code and execution. Send the original part code and the corresponding NSK reference will be quoted.