# NTN 7209BG Angular Contact Ball Bearing - 45 mm Bore, Open Type, Single Row - MROSupply.com

***NTN 7209BG single-row angular contact ball bearing with 45 mm straight bore. Open design without seals or shields. 72 series light cross-section for combined radial and axial loads at moderate speeds. Suitable for pumps, electric motors, and machine tool spindles.***



## Product details:

- Catalog number: 7209BG
- SKU: 277777
- Price: ***$111.29*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [Single Row Angular Contact Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/single-row-angular-contact-bearings/)
    - [Angular Contact Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.897 lb


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


## Product attributes;

  
- a (Load Center): 1.4567 in
  

  
- B (in): 0.7480
  

  
- 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
  

  
- Contact angle: 40 º
  

  
- D (in): 3.3465
  

  
- d (in): 1.7717
  

  
- Da max: 3.0709 in
  

  
- da min: 2.0472 in
  

  
- Db max: 3.1693 in
  

  
- db min: 1.9488 in
  

  
- Double Row Width: 1.4961 in
  

  
- Dynamic Load Rating: 8100 lbf
  

  
- Dynamic load rating: 8100 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 45 mm
  

  
- Limiting Speed - Grease: 7400 RPM
  

  
- Limiting speed - grease: 7400 RPM
  

  
- Limiting Speed - Oil: 9900 RPM
  

  
- Limiting speed - oil: 9900 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 85 mm
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Precision: ISO class 0
  

  
- Quadruple Row Width: 2.9921 in
  

  
- r (in): 0.0433
  

  
- r1: 0.0236 in
  

  
- r1as max: 0.0236 in
  

  
- ras max: 0.0394 in
  

  
- Static Load Rating: 5900 lbf
  

  
- Static load rating: 5900 lbf
  

  
- Triple Row Width: 2.2441 in
  

  
- Type: Angular Contact Ball Bearing
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/59/73/5973972/1162_S_9Tu0vwD.png)
## Alternate products to `NTN 7209BG Angular Contact Ball Bearing - 45 mm Bore, Open Type, Single Row - MROSupply.com`:
- [SKF 7209 BEP is a 45mm bore angular contact ball bearing with a 40° contact angle and enhanced polyamide cage. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/313680/as-markdown/)
- [Nachi Bearing 7209B Angular Contact Ball Bearing Single 40](https://www.mrosupply.com/products/207961/as-markdown/)
- [Rollway 7209 B 45 mm Bore Size, 85 mm Outside Diameter, Angular Contact Ball Bearing, Straight Bore, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2889852/as-markdown/)
- [SKF 7209 BECBJ is a 45mm bore angular contact ball bearing with a 40° contact angle and machined brass cage. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/313574/as-markdown/)
- [FAG 7209B.TVP single-row angular contact ball bearing with 45mm bore and polyamide cage. Ball-guided cage design reduces noise and supports high-speed operation. Handles combined radial and axial loads. Precision engineering from Schaeffler.](https://www.mrosupply.com/products/2176521/as-markdown/)
- [NSK 7209BEAT85 single-row angular contact ball bearing with 45 mm bore and 40° contact angle. Polyamide cage. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/5035107/as-markdown/)
- [FAG 7209B.JP single row angular contact ball bearing, 45mm bore, ball-guided sheet metal cage. Designed for high-speed applications requiring combined axial and radial loads. Precision engineering from Schaeffler.](https://www.mrosupply.com/products/2176515/as-markdown/)
- [NSK 7209BWG single-row angular contact ball bearing with 45 mm bore and 85 mm OD. Features a 40° contact angle and machined brass cage for high-speed operation. Designed for combined radial and axial loads in pumps, gearboxes, and machine-tool spindles.](https://www.mrosupply.com/products/5035109/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.