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The NU 318 ECJ is a type of cylindrical roller bearing. Here’s a breakdown of its designation and key features:

1. NU Designation:

• NU indicates the type of cylindrical roller bearing. In this case:
  • NU: The bearing has two fixed ribs on the outer ring and no ribs on the inner ring. This design allows the inner ring and rollers to move axially relative to the outer ring, making it suitable for applications where axial displacement needs to be accommodated.

2. 318:

• This is the size designation of the bearing.
• 3: Indicates the series (medium-heavy duty).
• 18: Refers to the bore diameter. For metric bearings, the bore diameter can be calculated as:
  • Bore diameter (มิลลิเมตร) = 18 × 5 = 90 มิลลิเมตร.

3. ECJ:

• EC: Stands for “Optimized Internal Design.” This indicates that the bearing has an enhanced internal geometry, providing higher load capacity and better performance.
• J: Refers to the material and design of the cage (retainer). In this case, J indicates a pressed steel cage.

Key Features of NU 318 ECJ:

• Type: Cylindrical roller bearing (NU type).
• Bore Diameter: 90 มิลลิเมตร.
• Outer Diameter: Approximately 190 มิลลิเมตร (standard for NU 318 series).
• ความกว้าง: Approximately 43 มิลลิเมตร (standard for NU 318 series).
• Cage: Pressed steel cage (J).
• Load Capacity: High radial load capacity due to the EC (optimized internal design).
• Axial Displacement: Suitable for applications requiring axial displacement of the shaft relative to the housing.

Applications:

NU-type cylindrical roller bearings are commonly used in:

• Electric motors.
• Gearboxes.
• Industrial machinery.
• Applications where high radial loads and axial displacement are present.

If you need further details like exact dimensions, load ratings, or specific application guidance, let me know!