Cylindrical roller bearings are designed to handle heavy radial loads and operate at high speeds. They come in various sizes and configurations to suit different applications. Here’s a summary of the typical sizes and dimensions for cylindrical roller bearings:
Basic Designations
Cylindrical roller bearings are typically categorized by their design, denoted by specific series designations. Common series include:
N Series: Single row, inner ring has two flanges, outer ring has no flanges.
NU Series: Single row, outer ring has two flanges, inner ring has no flanges.
NJ Series: Single row, outer ring has two flanges, inner ring has one flange.
NUP Series: Single row, outer ring has two flanges, inner ring has one flange and a loose flange ring.
NF Series: Single row, outer ring has one flange, inner ring has two flanges.
NN Series: Double row, used for applications requiring high radial load capacity.
NNU Series: Double row, used for high radial load applications with greater rigidity.
Common Sizes and Dimensions
Cylindrical roller bearings come in a wide range of sizes. Here is a summary of typical dimensions for some of the common series:
NU Series
Inner Diameter (d): 20 mm to 400 mm
Outer Diameter (D): 47 mm to 720 mm
Width (B): 14 mm to 180 mm
NJ Series
Inner Diameter (d): 20 mm to 400 mm
Outer Diameter (D): 47 mm to 720 mm
Width (B): 16 mm to 180 mm
NUP Series
Inner Diameter (d): 20 mm to 300 mm
Outer Diameter (D): 47 mm to 460 mm
Width (B): 14 mm to 100 mm
NN Series (Double Row)
Inner Diameter (d): 30 mm to 400 mm
Outer Diameter (D): 55 mm to 600 mm
Width (B): 19 mm to 280 mm
NNU Series (Double Row)
Inner Diameter (d): 30 mm to 400 mm
Outer Diameter (D): 55 mm to 600 mm
Width (B): 19 mm to 280 mm
Specific Examples of Bearing Sizes
Here are some specific examples to illustrate the range of sizes:
NU2205
d: 25 mm
D: 52 mm
B: 18 mm
NJ306
d: 30 mm
D: 72 mm
B: 19 mm
NUP310
d: 50 mm
D: 110 mm
B: 27 mm
NN3010
d: 50 mm
D: 80 mm
B: 23 mm
NNU4922
d: 110 mm
D: 150 mm
B: 40 mm
Tolerances and Precision Classes
Cylindrical roller bearings are available in various tolerance classes, which determine their precision. Common tolerance classes include:
P0 (Normal): Standard tolerance, suitable for general applications.
P6 (Higher precision): Used in applications requiring higher accuracy and speed.
P5, P4, P2 (High to ultra-high precision): Used in high-precision machinery, such as machine tools and aerospace applications.
Load Ratings
Cylindrical roller bearings are designed to handle high radial loads. The load rating varies based on the bearing size and series:
Dynamic Load Rating (C): The load a bearing can handle for 1 million rotations.
Static Load Rating (C0): The maximum load a bearing can withstand without permanent deformation.
Common Applications
Industrial Gearboxes
Electric Motors
Machine Tools
Rolling Mills
Cranes and Lifting Equipment
Railway Axles
Conclusion
Cylindrical roller bearings come in a wide range of sizes and configurations to accommodate different loads, speeds, and precision requirements. When selecting a bearing, it's essential to consider the specific requirements of your application, including load capacity, speed, and installation dimensions. Consult the manufacturer's catalog or technical support for detailed specifications and recommendations tailored to your needs.
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