# NTN 51210 Thrust Ball Bearing - 50 mm Bore, Single Direction, Straight Bore - MROSupply.com

***NTN 51210 single direction thrust ball bearing with a 50 mm straight bore. Designed for axial loads in one direction, this bearing features a separable design for easy mounting and dismounting. Suitable for machine tool spindles, clutches, and vertical shaft applications.***



## Product details:

- Catalog number: 51210
- SKU: 283294
- Price: ***$84.41*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [Ball Thrust Bearings](htts://www.mrosupply.com/bearings/ball-bearings/ball-thrust-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.814 lb


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


## Product attributes;

  
- 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): 1.9685
  

  
- D (in): 3.0709
  

  
- D1: 2.0472 in
  

  
- d1: 3.0709 in
  

  
- Da max: 2.6378 in
  

  
- da min: 2.6378 in
  

  
- Dynamic Load Rating: 10900 lbf
  

  
- Dynamic load rating: 10900 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 50 mm
  

  
- Limiting Speed - Grease: 2400 RPM
  

  
- Limiting speed - grease: 2400 RPM
  

  
- Limiting Speed - Oil: 3400 RPM
  

  
- Limiting speed - oil: 3400 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 78 mm
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Outside Ring Type: Straight
  

  
- Precision: ISO class 0
  

  
- r (in): 0.0394
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- ras max: 0.0394 in
  

  
- Seal material: None
  

  
- Seal type: None
  

  
- Static Load Rating: 25000 lbf
  

  
- Static load rating: 25000 lbf
  

  
- T (in): 0.8661
  

  
- Type: Thrust Ball Bearing
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048886/1264_S_mICK0xq.png)
## Alternate products to `NTN 51210 Thrust Ball Bearing - 50 mm Bore, Single Direction, Straight Bore - MROSupply.com`:
- [Rollway 51210 50 mm Bore Size, 78 mm Outside Diameter, Thrust Ball Bearing, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2302296/as-markdown/)
- [SKF 51210 is a 50mm bore thrust ball bearing with a sheet metal cage. Designed for axial loads in one direction, it accommodates moderate speeds and is suitable for machine tool spindles, gearboxes, and general industrial applications.](https://www.mrosupply.com/products/320538/as-markdown/)
- [NSK 51210 thrust ball bearing with 50 mm bore. Designed for pure axial loads in vertical-shaft applications. Backed by NSK's precision-bearing engineering heritage.](https://www.mrosupply.com/products/5032838/as-markdown/)
- [FAG 51210 single direction thrust ball bearing with 50mm bore and 78mm OD. Designed for axial loads in one direction, this bearing offers reliable performance in moderate-speed applications. Precision-ground raceways ensure smooth operation. Suitable for machine tools, gearboxes, and industrial machinery.](https://www.mrosupply.com/products/2171517/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.