Single Row Cylindrical Roller Bearings
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Understanding Cylindrical Roller Bearings Single Row
AMIGO’s Single-Row Cylindrical Roller Bearings are designed for high radial load capacity and reduced friction. They feature separable inner and outer rings for easy assembly. Constructed from heat-treated, high-quality steel, these bearings are built to last even under heavy loads. Our AMIGO bearings are fully interchangeable with leading brands like SKF, SIGMA, NSK, CRAFT, and FBJ, offering equivalent performance and reliability.
Features and benefits
- Load Capacity: Ideal for heavy radial loads, making them perfect for demanding applications in industries like mining, automotive, and aerospace.
- Versatility: These bearings come in various configurations (NU, NJ, NUP) to suit different applications.
- Maintenance and Longevity: Designed for long service life with minimal maintenance, thanks to their robust construction and superior materials.
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 Industry: Used in gearboxes, transmissions, and differentials where high radial load support is crucial.
- Industrial Machinery: Found in heavy-duty machinery like presses, compressors, and conveyor systems.
- Aerospace Industry: Essential in aircraft engines and landing gear systems for their ability to withstand high loads and stress.
Single Row Cylindrical Roller Bearing Size Chart
Customize bearings to meet your specific needs
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Single Row Cylindrical Roller Bearings - Designs and Variants
Single row cylindrical roller bearings come in several designs and variants, each tailored to specific applications. The main designs include:
- NU Design: Ideal for applications where axial displacement between the shaft and housing must be accommodated.
- NJ Design: Features an integral flange on the inner ring, providing axial location in one direction.
- NUP Design: Includes an additional locating ring, allowing axial location in both directions.
- N Design: The simplest variant, suitable for radial loads only, without the capability to handle axial loads.
Each design is available in various sizes and configurations, making it easy to find the right bearing for your application.
Single Row Cylindrical Roller Bearings Loads
Equivalent Bearing Loads
The equivalent bearing load combines the radial and axial loads acting on the bearing. For single row cylindrical roller bearings, the equivalent load calculation helps determine the stress distribution across the bearing, ensuring optimal performance and longevity.
Permissible Axial Loads
The permissible axial load for single row cylindrical roller bearings is determined by the bearing design and the operating conditions. While these bearings are optimized for radial loads, the NJ and NUP variants can manage moderate axial loads in one or both directions. The permissible load is a function of the bearing's size, material strength, and lubrication quality, ensuring the bearing operates efficiently without premature wear or failure. Always consult the manufacturer's specifications to determine the safe axial load limits for your application.
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Minimum Load for Single Row Cylindrical Roller Bearings
Single row cylindrical roller bearings must operate under a minimum load to prevent slippage of the rolling elements. If the load is too low, the bearing may experience skidding, leading to increased wear and potential damage. The minimum load depends on the bearing's size, operating speed, and lubricant viscosity.
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Single Row Cylindrical Roller Bearings Dynamic Axial Load Carrying Capacity
Single row cylindrical roller bearings primarily handle radial loads; however, they can carry limited axial loads depending on their design. The dynamic axial load carrying capacity is influenced by factors such as the bearing's internal geometry, the number of rolling elements, and the lubrication used. Typically, only certain designs, like NJ or NUP, can support axial loads effectively. It's crucial to select the correct bearing type to ensure it meets the application's axial load requirements.
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Designation System for Single Row Cylindrical Roller Bearings
Single row cylindrical roller bearings are identified by specific codes that describe their design and features. These designation codes include prefixes, basic designations, and suffixes that provide information on bearing series, bore size, and special features.
| Category | Code | Description |
|---|---|---|
| Prefixes | L | Separate inner or outer ring of a separable bearing |
| R | Inner or outer ring with roller and cage assembly of a separable bearing | |
| Basic Designation | CRL | Inch bearing |
| CRM | Inch bearing | |
| HJ | Angle ring | |
| Bearing Size (Inch Bearings) | 8 to 40 | Bore diameter from 1 inch (25.4 mm) to 5 inches (127 mm) |
| Suffixes - Internal Design | A | Deviating or modified internal design |
| EC | Optimized internal design with more/larger rollers and modified roller end/flange contact | |
| Suffixes - External Design | K | Tapered bore, taper 1:12 |
| N | Snap ring groove in the outer ring | |
| NR | Snap ring groove in the outer ring with associated snap ring | |
| N1 | One locating slot (notch) in one outer ring side face | |
| N2 | Two locating slots (notches) in one outer ring side face, 180° apart | |
| Suffixes - Cage Design | FR | Pin-type steel cage, pierced rollers |
| J | Stamped steel cage, roller-centered | |
| L | Machined light alloy cage, roller-centered | |
| LA | Machined light alloy cage, outer ring-centered | |
| LB | Machined light alloy cage, inner ring-centered | |
| LL | Machined light alloy cage, window-type, inner or outer ring-centered | |
| M | Machined brass cage, roller-centered | |
| MA(S) | Machined brass cage, outer ring-centered with lubrication groove (S) | |
| MB | Machined brass cage, inner ring-centered | |
| ML | Machined brass cage, window-type, inner or outer ring-centered | |
| MP | Machined brass cage, window-type, inner or outer ring-centered depending on size | |
| MR | Machined brass cage, window-type, roller-centered | |
| P | Glass fiber reinforced PA66 cage, roller-centered | |
| PA | Glass fiber reinforced PA66 cage, outer ring-centered | |
| PH | Glass fiber reinforced PEEK cage, roller-centered | |
| PHA | Glass fiber reinforced PEEK cage, outer ring-centered | |
| Suffixes - Materials/Heat Treatment | HA1 | Case-hardened inner and outer rings |
| HA2 | Case-hardened outer ring | |
| HA3 | Case-hardened inner ring | |
| HB1 | Bainite-hardened inner and outer rings | |
| HB3 | Bainite-hardened inner ring | |
| HN1 | Inner and outer rings with special surface heat treatment | |
| Suffixes - Accuracy/Clearance/Preload | CN | Normal radial internal clearance, combined with letters indicating reduced/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 | W33 | Annular groove and three lubrication holes in the outer ring |
| Suffixes - Other Variants | PEX | SKF Explorer bearing |
| VA301 | Bearing for railway vehicle traction motors | |
| VA305 | VA301 + special inspection routines | |
| VA350 | Bearing for railway axleboxes | |
| VA380 | Bearing for railway axleboxes in accordance with EN 12080, class 1 | |
| VA3091 | VA301 + external surfaces of the outer ring are coated with aluminium oxide | |
| VC025 | Bearing with special wear-resistant raceways for applications in heavily contaminated environments | |
| VQ015 | Inner ring with crowned raceway for increased permissible misalignment |
Single Row Cylindrical Roller Bearing Catalogue
Explore our comprehensive Single Row Cylindrical Roller Bearing Catalogue in PDF format, featuring detailed specifications, dimensions, and performance data for AMIGO bearings. This catalogue is essential for selecting the right bearing for your application, offering full interchangeability with leading brands like SKF, SIGMA, NSK, CRAFT, and FBJ. Download the PDF to access all the information you need to decide on our high-quality, durable bearings.
General bearing specifications
| Specification | Details |
|---|---|
| Dimension Standards | Boundary dimensions: ISO 15 |
| HJ angle rings: ISO 246 | |
| Snap rings and grooves: ISO 464 | |
| Locating slots: ISO 20515 | |
| Tolerances | Normal dimensional tolerance |
| P6 run-out | |
| Check availability of P5 or P6 tolerance class for bearings in the 10 series | |
| Values: ISO 492 | |
| Radial Internal Clearance | Normal, C3 |
| Check availability of other clearance classes | |
| Values: ISO 5753-1 | |
| cylindrical bore | |
| tapered bore | |
| Values are valid for unmounted bearings under zero measuring load. | |
| Axial Internal Clearance | NUP design |
| NJ design with HJ angle ring | |
| 10, 18, 19, 2, 3, 4 series: ≈ the radial internal clearance | |
| 22, 23, 29, 39 series: ≈ 2/3 the radial internal clearance | |
| Permissible Misalignment | 10, 12, 18, 19, 2, 3, 4 series: ≈ 4 minutes of arc |
| 20, 22, 23, 29, 39 series: ≈ 3 minutes of arc | |
| Misalignment increases bearing noise and reduces service life. | |
| Permissible Axial Displacement | Bearings having 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. As a result, there is virtually no increase in friction. |
| Specification | Details |
|---|---|
| Dimension Standards | Boundary dimensions: BS 292-2 |
| Tolerances | Normal |
| Values: BS 292-2 | |
| Radial Internal Clearance | Normal |
| Values: ISO 5753-1 | |
| Values are valid for unmounted bearings under zero measuring load. | |
| Permissible Misalignment | ≈ 4 minutes of arc |
| Misalignment increases bearing noise and reduces bearing service life, making these effects particularly noticeable when exceeding the guideline value. | |
| Permissible Axial Displacement | The bearings can accommodate axial displacement of the shaft relative to the housing within the bearing. As a result, there is virtually no increase in friction. |
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Frequently Asked Question
Q: What are single-row cylindrical Roller Bearings?
A: Single-row cylindrical Roller Bearings are a type of roller bearing that uses cylindrical rollers as their rolling elements. These bearings are characterized by their ability to carry high radial loads and are commonly used in applications requiring precise alignment and high speed, such as machine tools.
Q: What are the benefits of using cylindrical roller bearings over ball bearings?
A: Cylindrical roller bearings provide higher radial load capacity than ball bearings due to the increased contact area between the rollers and raceways. This makes them ideal for heavy load applications. Additionally, cylindrical roller bearings have high rigidity and can operate at high speeds.
Q: How does the dynamic load rating differ from the static load rating in cylindrical roller bearings?
A: The dynamic load rating refers to the maximum load a bearing can sustain while allowing for a specified life expectancy under dynamic conditions. On the other hand, the static load rating is the maximum load a bearing can handle without permanent deformation when at rest. For single row cylindrical roller bearings, these ratings are crucial in determining their suitability for specific applications.
Q: What is the significance of bearing clearance in cylindrical roller bearings, such as C3 clearance?
A: Bearing clearance, such as C3, indicates the internal clearance within the bearing. C3 clearance provides greater internal space than standard clearance, allowing for better heat dissipation and accommodating temperature changes during operation. This is particularly important in high-speed applications.
Q: What does the "NU" designation mean in single row cylindrical roller bearings?
A: The “NU” designation indicates a type of single row cylindrical roller bearing where the outer ring has two integral flanges and the inner ring has no flanges. This allows for axial displacement of the shaft relative to the housing in both directions.
Q: In what applications are single row cylindrical roller bearings typically used?
A: Single row cylindrical roller bearings are commonly used in machine tools, electric motors, pumps, gearboxes, and other applications requiring high radial loads and precise alignment. Their ability to handle high speeds and rigidity makes them ideal for these uses.
Q: How do the NJ and NUP designations differ in single row cylindrical roller bearings?
A: The NJ designation refers to a bearing where the outer ring has two integral flanges and the inner ring has one integral flange and one loose flange, allowing it to accommodate axial displacement in one direction. The NUP designation includes two integral flanges on the outer ring and one integral flange and one loose flange ring on the inner ring, permitting axial displacement in both directions.
Q: What is the purpose of the inner and outer rings in cylindrical roller bearings?
A: The inner and outer rings provide the raceways for the cylindrical rollers. The inner ring is mounted onto the shaft, while the outer ring is housed in the bearing assembly. Together they ensure smooth rotation and efficient load distribution.
Q: How does SKF cylindrical roller bearings compare to other brands?
A: SKF cylindrical roller bearings are renowned for their high quality, reliability, and precision. They offer better performance and extended service life and are available in a wide range of sizes and configurations. SKF also produces specialized bearings like the NU and NJ series for various industrial applications.
Q: What are the typical materials used for the cage in cylindrical roller bearings?
A: The cage in cylindrical roller bearings is typically made from materials like machined brass, pressed steel, or polyamide. These materials are chosen for their strength, durability, and ability to reduce friction and heat during operation.