NU311 55x120x29 Bearing
Single Row Cylindrical Roller Bearing
The NU311 Single Row Cylindrical Roller Bearing is designed for high radial loads in industrial applications. With a bore diameter of 55mm, outside diameter of 120mm, and width of 29mm, it’s ideal for gearboxes, motors, and pumps. The cylindrical rollers provide even load distribution, reducing friction and wear, while the separable design ensures easy installation and maintenance.
Performance Overview of the NU311 Bearings
| Specifications | Details |
|---|---|
| Brand | AMIGO NU311 | Interchangeable With: SKF NU311 |
| Bore diameter | 55 mm |
| Outside diameter | 120 mm |
| Width | 29 mm |
| Basic dynamic load rating | 156 kN |
| Basic static load rating | 143 kN |
| Reference speed | 6 000 r/min |
| Limiting speed | 7 000 r/min |
| Product net weight | 1.43 kg |
| Bearing part | Complete bearing |
| Axial displacement capability | In both directions |
| Number of rows | 1 |
| Locating feature, bearing outer ring | None |
| Bore type | Cylindrical |
| Cage | Non-metallic |
| Number of flanges, outer ring | 2 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | CN |
| Tolerance class | Normal |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Dimensions(mm) | 55x120x29 |
| Specifications | Details |
|---|---|
| Brand | AMIGO NU311 | Interchangeable With: SKF NU311 |
| Bore diameter | 2.165 in |
| Outside diameter | 4.724 in |
| Width | 1.142 in |
| Basic dynamic load rating | 35,070 lbf |
| Basic static load rating | 32,148 lbf |
| Reference speed | 6,000 r/min |
| Limiting speed | 7,000 r/min |
| Product net weight | 3.163 lb |
| Bearing part | Complete bearing |
| Axial displacement capability | In both directions |
| Number of rows | 1 |
| Locating feature, bearing outer ring | None |
| Bore type | Cylindrical |
| Cage | Non-metallic |
| Number of flanges, outer ring | 2 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | CN |
| Tolerance class | Normal |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Dimensions(in) | 2.165x4.724x1.142 |
Specifications Overview of the NU311 Bearings
| Specifications | Details |
|---|---|
| Bore diameter | 55 mm |
| Outside diameter | 120 mm |
| Width | 29 mm |
| Shoulder diameter of outer ring | 100.3 mm |
| Raceway diameter of inner ring | 70.5 mm |
| Chamfer dimension r1,2 | min. 2 mm |
| Chamfer dimension r3,4 | min. 2 mm |
| Permissible axial displacement | max. 2 mm |
| Diameter of spacer sleeve da | min. 65 mm |
| Diameter of spacer sleeve da | max. 68 mm |
| Diameter of shaft abutment db | min. 73 mm |
| Diameter of housing abutment Da | max. 109.2 mm |
| Radius of fillet ra | max. 2 mm |
| Radius of fillet rb | max. 2 mm |
| Specifications | Details |
|---|---|
| Bore diameter | 2.165 in |
| Outside diameter | 4.724 in |
| Width | 1.142 in |
| Shoulder diameter of outer ring | 3.949 in |
| Raceway diameter of inner ring | 2.776 in |
| Chamfer dimension r1,2 | min. 0.079 in |
| Chamfer dimension r3,4 | min. 0.079 in |
| Permissible axial displacement | max. 0.079 in |
| Diameter of spacer sleeve da | min. 2.559 in |
| Diameter of spacer sleeve da | max. 2.677 in |
| Diameter of shaft abutment db | min. 2.874 in |
| Diameter of housing abutment Da | max. 4.299 in |
| Radius of fillet ra | max. 0.079 in |
| Radius of fillet rb | max. 0.079 in |
Applicable Machines and Industries
1. Electric Motors
- Purpose: The NU311 bearing supports the rotor and withstands the radial loads generated during motor operation.
- Common Brands: Siemens, ABB, Toshiba
2. Gearboxes
- Purpose: In gearboxes, the NU311 bearing handles high radial loads while allowing for smooth gear operation.
- Common Brands: SEW-Eurodrive, Bonfiglioli, Rexnord
3. Pumps
- Purpose: This bearing is used in pump shafts to support radial loads, ensuring efficient pump operation.
- Common Brands: Grundfos, KSB, Sulzer
4. Conveyor Systems
- Purpose: The bearing supports the conveyor rollers, helping to carry heavy loads across industrial systems.
- Common Brands: FlexLink, Dematic, Hytrol
5. Heavy Machinery
- Purpose: In heavy equipment like cranes and excavators, NU311 bearings provide support for heavy loads and rotational elements.
- Common Brands: Caterpillar, Komatsu, Liebherr
6. Wind Turbines
- Purpose: The bearing is used in the turbine’s main shaft to support the weight and manage the radial loads due to wind force.
- Common Brands: Vestas, GE Renewable Energy, Siemens Gamesa
NU311 Bearing Cross Reference and Interchange
| Brand | Bearing Model |
|---|---|
| Amigo | NU311 |
| FAG | NU311-E-XL-TVP2 |
| KOYO | NU311R |
| SKF | NU311ECP |
| NTN | NU311 |
| NSK | NU311EM |
This table summarizes the bearing cross-reference and interchange guide for the NU311 Single Row Cylindrical Roller Bearing. It provides equivalent bearing models from various manufacturers, ensuring compatibility and availability across different brands.
Choosing the Right Bearing
When comparing the Amigo NU311 bearing to other similar models, several key advantages make it the superior choice for various applications:
When to Choose the NU311 Bearing:
- Heavy Radial Loads: Ideal for machinery subjected to high radial loads such as electric motors and gearboxes.
- High-Speed Applications: Suitable for equipment operating at high speeds due to its robust construction and precise engineering.
- Space Constraints: Choose NU311 when you need a compact bearing that delivers high performance without occupying much space.
- Durable Performance: Opt for NU311 in applications requiring long service life and minimal maintenance.
- Temperature Variability: Best for environments where temperature variations are common, thanks to its wide operating temperature range.
Amigo NU311 bearings provide exceptional durability, higher load capacities, and seamless compatibility with other leading brands like SKF and FAG, all at a more competitive price point. This makes them the optimal choice for industries requiring reliable performance under demanding conditions.
| Feature | Amigo NU311 | SKF NU311ECP | FAG NU311-E-XL-TVP2 | NTN NU311 | NSK NU311EM |
|---|---|---|---|---|---|
| Cage Material | Non-metallic | Steel | Polyamide | Brass | Steel |
| Operating Temperature Range | -40°C to 120°C | -30°C to 150°C | -30°C to 120°C | -40°C to 120°C | -30°C to 150°C |
| Grease Lubrication Limit Speed (rpm) | 5900 | 7000 | 6100 | 6700 | 6300 |
| Fatigue Limit Load (kN) | 13.6 | 13.6 | 13.4 | 13.5 | 13.4 |
| Radial Clearance Class | CN | CN | CN | CN | CN |
Recommended Products for Optimal Performance
Enhance your bearing operations with these related products:
Why Amigo NU311 Bearings Are the Top Choice
I recently installed the Amigo NU311 bearing in our industrial machinery, and I must say, the performance is outstanding. The bearing operates smoothly under heavy loads, just like the SKF bearings we've used before. The quality is on par with the best in the market, and we’re highly satisfied with its durability.
John Anderson
Switching to the Amigo NU311 was a great decision for our production line. The installation was straightforward, and the bearing has been running flawlessly ever since. It feels just as reliable as the FAG bearings we’ve previously used, making it a top choice for us.
Michael Davis
Our experience with the Amigo NU311 bearing has been nothing short of excellent. The bearing's performance is comparable to the high-end NSK bearings we've relied on for years. It's built to last, and we appreciate the quality and value it offers.
David Thompson
The Amigo NU311 bearing has exceeded our expectations. It’s been a reliable component in our equipment, delivering the same smooth operation we’ve come to expect from brands like NTN. I would definitely recommend it for any heavy-duty application.
Sarah Miller
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