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Nomenclature for "NU 318" bearings

 The nomenclature for bearings, such as the "NU 318" bearing, follows a standardized system that provides information about the bearing's type, dimensions, and other characteristics. Here's a breakdown of the "NU 318" bearing nomenclature:

1. **NU**: This indicates the type of bearing.
   - **NU** stands for a cylindrical roller bearing with two flanges on the outer ring and no flanges on the inner ring. This design allows the inner ring to move axially relative to the outer ring, making it suitable for applications where axial displacement needs to be accommodated.

2. **3**: This digit represents the series of the bearing, which indicates the overall size and load capacity.
   - **3** typically refers to a medium series bearing, which is designed to handle moderate loads and speeds.

3. **18**: This number indicates the bore diameter of the bearing.
   - The bore diameter is calculated by multiplying the last two digits by 5. In this case, **18 x 5 = 90 mm**. So, the bore diameter of the NU 318 bearing is 90 mm.

### Summary:
- **NU**: Cylindrical roller bearing with two flanges on the outer ring and no flanges on the inner ring.
- **3**: Medium series bearing.
- **18**: Bore diameter of 90 mm (18 x 5).

This nomenclature helps in identifying the bearing's type, size, and suitability for specific applications.

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