# NTN BL211 Deep Groove Ball Bearing - 55 mm Bore, Open Type, Single Row Radial - MROSupply.com

***NTN BL211 single-row deep groove ball bearing with 55 mm straight bore. Open type design without seals or shields for low-friction operation. Suitable for general industrial applications requiring radial and axial load support in electric motors, pumps, and fans.***



## Product details:

- Catalog number: BL211
- SKU: 276382
- Price: ***$106.05*** 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: 0.002 lb


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


## Product attributes;

  
- B (in): 0.8268
  

  
- 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): 3.9370
  

  
- d (in): 2.1654
  

  
- da max: 2.6378 in
  

  
- Da max: 3.622 in
  

  
- da min: 2.4803 in
  

  
- Enclosure: Open
  

  
- I.D.: 55 mm
  

  
- Limiting Speed - Grease: 5800 RPM
  

  
- Limiting speed - grease: 5800 RPM
  

  
- Limiting Speed - Oil: 6800 RPM
  

  
- Limiting speed - oil: 6800 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 100 mm
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Precision: Class 0
  

  
- r (in): 0.0591
  

  
- r1: 0.0197 in
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- Seal material: None
  

  
- Seal type: None
  

  
- Type: Deep Groove Ball Bearing
  

  
- Width: 21 mm
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048825/1148_S_oKE47Yd.png)
## Alternate products to `NTN BL211 Deep Groove Ball Bearing - 55 mm Bore, Open Type, Single Row Radial - MROSupply.com`:
- [SKF 211 is a 55mm bore deep groove ball bearing. It features a pressed steel cage and normal internal clearance. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/317645/as-markdown/)
- [NSK BL211 max type ball bearing, 55 mm bore, 100 mm OD, open design. No seals or shields for high-speed operation and easy relubrication. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5035612/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.