Double Row Cylindrical Roller Bearings
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Understanding Double Row Cylindrical Roller Bearings
AMIGO’s Double Row Cylindrical Roller Bearings are engineered for heavy-duty applications, offering exceptional radial load capacity and durability. These bearings are fully interchangeable with renowned brands like SKF, ensuring easy integration and replacement in your machinery. AMIGO bearings are designed to meet the highest industry standards and provide a reliable and cost-effective solution for a wide range of industrial applications. Whether in automotive, aerospace, or heavy machinery, AMIGO’s bearings deliver performance that matches or exceeds leading global brands.
Features and benefits
- High Load Capacity: Supports both radial and axial loads, making them ideal for heavy-duty applications.
- Durability: Designed for long service life with high-quality materials.
- Interchangeable: Fully compatible with major brands like SKF, ensuring easy replacement and integration.
- Low Friction: Optimized internal design reduces friction, enhancing efficiency.
- High-Speed Performance: Suitable for applications requiring high-speed operation.
- Precision: Maintains accurate alignment under heavy loads, ensuring reliable performance.
Temperature Limits
The permissible operating temperature for cylindrical roller bearings can be limited by:
- Dimensional Stability of the Bearing Rings and Rollers
- Cage
- Lubricant
Cylindrical roller bearings are heat stabilized up to 150 °C (300 °F).
Applications
- Automotive Gearboxes: Supports high radial and axial loads for reliable operation.
- Industrial Gearboxes: Provides durability and precision in heavy-duty machinery.
- Electric Motors: Ensures smooth, efficient performance in high-speed applications.
- Wind Turbines: Handles varying loads in challenging environmental conditions.
- Material Handling Equipment: Offers high load capacity for conveyor systems and cranes.
- Pumps and Compressors: Enhances performance and longevity in industrial pumping systems.
Double Row Cylindrical Roller Bearings Size Chart
| Designation | d [mm] | D [mm] | B [mm] | Bearing Dimensions Chart Pdf |
|---|---|---|---|---|
| N 307 | 35 | 80 | 21 | Download |
| N 309 | 45 | 100 | 25 | Download |
| N 312 | 60 | 130 | 31 | Download |
| NJ209 | 45 | 85 | 19 | Download |
| NN3020 | 100 | 137 | 37 | Download |
| NN3024K | 120 | 165 | 46 | Download |
| NN3040K | 200 | 310 | 82 | Download |
| NU214 | 70 | 125 | 24 | Download |
| NU305 | 25 | 62 | 17 | Download |
| NU318 | 90 | 190 | 43 | Download |
| NN3016 | 80 | 125 | 34 | Download |
| NN3018 | 90 | 140 | 37 | Download |
| NNU 4924 | 120 | 165 | 45 | Download |
| SL 045032 PP 2NR | 160 | 240 | 109 | Download |
| 315976 B | 280 | 470 | 200 | Download |
| BC2B 320118 | 340 | 520 | 305 | Download |
| NNU 4930 B/SPW33 | 150 | 210 | 60 | Download |
| NNU 41/600 M/W33 | 600 | 980 | 375 | Download |
| NNU4948 | 240 | 320 | 80 | Download |
| 316019 | 410 | 600 | 220 | Download |
| BC2B 320119 | 300 | 460 | 180 | Download |
| NNU 4152 M/W33 | 260 | 440 | 180 | Download |
| NN 3007 K/SP | 35 | 62 | 20 | Download |
| NN 3016 KTN/SP | 80 | 125 | 34 | Download |
| NNU 49/500 BK/SPW33X | 500 | 670 | 170 | Download |
| NNU 4932 B/SPW33 | 160 | 220 | 60 | Download |
| NN 3026 KTN9/SPW33 | 130 | 200 | 52 | Download |
| NN 3032 K/SPW33 | 160 | 240 | 60 | Download |
| NN 3009 KTN/SP | 45 | 75 | 23 | Download |
Customize bearings to meet your specific needs
Looking for bearings tailored to your unique specifications? Our customization service ensures that each bearing is designed and manufactured to meet your exact requirements, providing the perfect solution for your application. Click the "Enquire Now" button to discuss your needs with our experts and get started on your custom bearing solution today.
Double Row Cylindrical Roller Bearings - Designs and Variants
Double-row cylindrical roller bearings are essential for various industrial applications, offering high radial load capacity and durability.
- NU Design: Features no flanges on the inner ring, allowing for free axial movement. Suitable for non-locating bearing positions.
- NNU Design: Similar to the NU design but with a double-row structure, offering higher load capacity.
- NJ Design: Includes flanges on the inner ring, providing axial location in one direction, making it ideal for locating bearing positions.
- NN Design: Combines the benefits of NNU design with additional rigidity, suitable for high-precision applications.
- NUP Design: Equipped with a flange on both the inner and outer rings, providing axial location in both directions.
Double-row cylindrical roller bearings are indispensable in various industries, providing superior load capacity and reliability. Understanding the different designs and their applications helps select the right bearing for your needs.
Double Row Cylindrical Roller Bearings Loads
Minimum Load, Equivalent Bearing Loads
Double row cylindrical roller bearings must operate under a minimum load to ensure proper function and avoid roller skidding, which can lead to increased wear. The minimum load typically depends on the bearing's size, speed, and lubrication. The equivalent bearing load is a combined calculation of radial and axial loads, allowing the bearing to function efficiently under varying operational conditions.
Dynamic Axial Load Carrying Capacity
While double row cylindrical roller bearings are primarily designed to handle radial loads, they can also support limited axial loads depending on the specific design. The dynamic axial load capacity is determined by the internal geometry, roller design, and cage structure, ensuring the bearing can withstand axial forces while maintaining performance. This capacity is critical in applications where axial loads fluctuate or are significant.
Designation System for Double Row Cylindrical Roller Bearings
The Designation System for Double Row Cylindrical Roller Bearings categorizes different elements of the bearing’s design, such as internal and external features, cage designs, materials, and heat treatment options. This system uses specific codes and suffixes to indicate modifications, material types, tolerances, and lubrication options. These designations help users identify the precise specifications of a bearing, ensuring it meets the requirements for various industrial applications. This table provides an organized view of these codes, making it easier to select the right bearing for your needs.
| Category | Code | Description |
|---|---|---|
| Prefixes | (n.a.) | |
| Basic Designation | Listed in table 1 or drawing number identification | |
| Suffixes - Internal Design | A, B, C | Deviating or modified internal design |
| Suffixes - External Design | G | Helical groove in inner ring bore |
| K | Tapered bore, taper 1:12 | |
| K30 | Tapered bore, taper 1:30 | |
| Suffixes - Cage Design | F | Machined steel cage, roller centred |
| M | Machined brass cage, roller centred | |
| Suffixes - Materials, Heat Treatment | HA1 | Case-hardened inner and outer rings |
| HA4 | Case-hardened inner and outer rings and rollers | |
| HA5 | Case-hardened rollers | |
| HB1 | Bainite-hardened inner and outer rings | |
| Suffixes - Accuracy, Clearance, Preload, Quiet Running | CN | Normal radial internal clearance; additional letters identify reduced or displaced clearance ranges |
| C2 | Radial internal clearance smaller than Normal | |
| C3 | Radial internal clearance greater than Normal | |
| C4 | Radial internal clearance greater than C3 | |
| C5 | Radial internal clearance greater than C4 | |
| Suffixes - Bearing Sets, Matched Bearings | DR | Set of two matched bearings |
| TR | Set of three matched bearings | |
| QR | Set of four matched bearings | |
| Suffixes - Stabilization | S1 | Bearing rings heat stabilized for operating temperatures ≤ 200°C (390°F) |
| S2 | Bearing rings heat stabilized for operating temperatures ≤ 250°C (480°F) | |
| Suffixes - Lubrication | W20 | Lubrication holes in the outer ring |
| W33(X) | Annular groove and lubrication holes in the outer ring | |
| Suffixes - Other Variants | (n.a.) |
Double Row Cylindrical Roller Bearings Catalogue
Explore our comprehensive Double Row Cylindrical Roller Bearings PDF, which includes detailed information on the design, variants, loads, and designation system of these bearings. This PDF serves as a valuable resource, offering all the technical specifications and options available for double row cylindrical roller bearings, ensuring you have the right information for your industrial applications. Download the PDF to get full access to this critical information.
General bearing specifications
| Specification | Details |
|---|---|
| Dimension Standards | Boundary dimensions: ISO 15 |
| Bore and outside diameter for most bearings: diameter series 0 (ISO 15) | |
| Tolerances | Normal |
| Drawing number bearings: P6 dimensional tolerances, P5 geometrical tolerances | |
| Values: ISO 492 | |
| Radial Internal Clearance | Normal |
| Check availability of other clearance classes | |
| Range of C2 to C4 as identified in the Design variant/feature | |
| Values: ISO 5753-1 | |
| Values are valid for unmounted bearings under zero measuring load | |
| Permissible Misalignment | Misalignment increases bearing noise and reduces bearing service life. |
| For bearing arrangements where misalignment cannot be avoided, contact the SKF application engineering service | |
| Permissible Axial Displacement | Bearings with no flange, or only one integral flange on either the inner or outer ring, can accommodate axial displacement. Displacement of the shaft relative to the housing occurs within these bearings with virtually no increase in friction. |
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Double Row Cylindrical Roller Bearings FAQ
Q: What are Double Row Cylindrical Roller Bearings?
A:These bearings feature two rows of cylindrical rollers, offering higher radial load capacity and rigidity compared to single row bearings. They are ideal for applications requiring high precision and durability.
Q: What are the benefits of using Double Row Cylindrical Roller Bearings?
A:They provide superior load-bearing capacity, durability, and are interchangeable with major brands like SKF. These bearings are suitable for heavy-duty applications, offering low friction and high-speed performance.
Q: How do I choose the right bearing for my application?
A:Consider factors like load capacity, speed, misalignment tolerance, and axial displacement. Refer to the product specifications and consult with a bearing expert if needed.
Q: Can Double Row Cylindrical Roller Bearings accommodate misalignment?
A:These bearings can handle limited misalignment. However, significant misalignment increases noise and reduces bearing life. For applications with unavoidable misalignment, consult engineering support.
Q: What is the permissible axial displacement for these bearings?
A:Bearings with no or one integral flange can accommodate axial displacement within the bearing, minimizing friction.
Q: Are AMIGO Double Row Cylindrical Roller Bearings interchangeable with SKF?
A:Yes, AMIGO bearings are fully interchangeable with SKF and other leading brands, ensuring easy integration and replacement.