# NTN 51252 Thrust Ball Bearing - 260 mm Bore, Single Direction, Straight Bore - MROSupply.com

***NTN 51252 single direction thrust ball bearing with 260 mm straight bore. Separable construction for easy mounting and dismounting. Designed for axial loads in one direction in vertical shaft applications such as gearboxes, pumps, and machine tools.***



## Product details:

- Catalog number: 51252
- SKU: 2171269
- Price: ***$5,320.82*** 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: 53.352 lb
- UPC: 4547359306941


## 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: Brass
  

  
- Cage Material: Brass
  

  
- Cage type: Machined
  

  
- Cage Type: Machined
  

  
- Configuration: One
  

  
- D (in): 14.1732
  

  
- d (in): 10.2362
  

  
- D1: 10.3937 in
  

  
- d1: 13.9764 in
  

  
- Da max: 12.5591 in
  

  
- da min: 12.5591 in
  

  
- Dynamic load rating: 99000 lbf
  

  
- Dynamic Load Rating: 99000 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 260 mm
  

  
- Limiting speed - grease: 530 RPM
  

  
- Limiting Speed - Grease: 530 RPM
  

  
- Limiting speed - oil: 760 RPM
  

  
- Limiting Speed - Oil: 760 RPM
  

  
- Material: High Carbon Chrome Steel
  

  
- O.D.: 360 mm
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Outside Ring Type: Straight
  

  
- Precision: ISO Class 0
  

  
- r (in): 0.0827
  

  
- Radial internal clearance: CN
  

  
- Radial Internal Clearance: CN
  

  
- ras max: 0.0787 in
  

  
- Seal material: None
  

  
- Seal type: None
  

  
- Static load rating: 405000 lbf
  

  
- Static Load Rating: 405000 lbf
  

  
- T (in): 3.1102
  

  
- Type: Thrust Ball Bearing
  

  
- Width: 79 mm
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048886/1264_S_mICK0xq.png)






## 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.