# NTN BL218Z Deep Groove Ball Bearing - 90 mm Bore, Single Shielded, Medium Series - MROSupply.com

***NTN BL218Z is a medium series single-row deep groove ball bearing with a 90 mm straight bore and single shield. Designed for radial loads in electric motors, pumps, and general industrial machinery.***



## Product details:

- Catalog number: BL218Z
- SKU: 276339
- Price: ***$380.45*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [BL2 Series Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/bl2-series-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 5.160 lb
- UPC: 4547359028676


## Product images:
- https://static.mrosupply.com/images/noimage.webp


## Product attributes;

  
- B (in): 1.1811
  

  
- Ball Material: Steel
  

  
- Ball material: Steel
  

  
- Bore Type: Round
  

  
- Bore type: Round
  

  
- Cage Material: Steel
  

  
- Cage material: Steel
  

  
- Cage Type: Pressed
  

  
- Cage type: Pressed
  

  
- Configuration: One
  

  
- D (in): 6.2992
  

  
- d (in): 3.5433
  

  
- Da max: 5.9449 in
  

  
- da max: 4.2913 in
  

  
- da min: 3.8976 in
  

  
- Enclosure: Single Shielded
  

  
- Factor: 151
  

  
- I.D.: 90 mm
  

  
- Limiting Speed - Grease: 3600 RPM
  

  
- Limiting speed - grease: 3600 RPM
  

  
- Limiting Speed - Oil: 4200 RPM
  

  
- Limiting speed - oil: 4200 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 160 mm
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Precision: ISO class 0
  

  
- r (in): 0.0787
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- ras max: 0.0787 in
  

  
- Type: Deep Groove Ball Bearing
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048099/1151_S_rexnKIK.png)
## Alternate products to `NTN BL218Z Deep Groove Ball Bearing - 90 mm Bore, Single Shielded, Medium Series - MROSupply.com`:
- [NSK BL218Z Max Type ball bearing with 90 mm bore and 160 mm OD. It features a one-side metal shield (Z) for protection against contaminants while maintaining low friction. This bearing is designed for applications requiring high radial load capacity in a compact envelope, such as electric motors and pumps. Backed by NSK's precision-bearing engineering heritage.](https://www.mrosupply.com/products/5035639/as-markdown/)






## FAQ:

- How do I choose the right type of bearing for my application?: Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints.
For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials.
In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.


- What is the difference between deep groove and angular contact ball bearings?: Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors.
Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes.
If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.