# NTN 51228 Thrust Ball Bearing - 140 mm Bore, Single Direction, Straight Bore - MROSupply.com

***NTN 51228 single direction thrust ball bearing with a 140 mm straight bore. Designed for axial loads in one direction, this bearing features a separable design for easy mounting and dismounting. Suitable for vertical shaft applications in gearboxes, clutches, and machine tool spindles.***



## Product details:

- Catalog number: 51228
- SKU: 283285
- Price: ***$1,144.28*** 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: 9.766 lb
- UPC: 4547359306842


## 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): 7.8740
  

  
- d (in): 5.5118
  

  
- D1: 5.6299 in
  

  
- d1: 7.7559 in
  

  
- Da max: 6.9291 in
  

  
- da min: 6.9291 in
  

  
- Dynamic Load Rating: 43500 lbf
  

  
- Dynamic load rating: 43500 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 140 mm
  

  
- Limiting Speed - Grease: 980 RPM
  

  
- Limiting speed - grease: 980 RPM
  

  
- Limiting Speed - Oil: 1400 RPM
  

  
- Limiting speed - oil: 1400 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 200 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): 0.0591
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- ras max: 0.0591 in
  

  
- Seal material: None
  

  
- Seal type: None
  

  
- Static Load Rating: 134000 lbf
  

  
- Static load rating: 134000 lbf
  

  
- T (in): 1.8110
  

  
- Type: Thrust Ball Bearing
  

  
- Width: 46 mm
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048886/1264_S_mICK0xq.png)
## Alternate products to `NTN 51228 Thrust Ball Bearing - 140 mm Bore, Single Direction, Straight Bore - MROSupply.com`:
- [SKF 51228 is a 140mm 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/320977/as-markdown/)
- [NSK 51228 thrust ball bearing with 140 mm bore. Designed for pure axial loads in vertical-shaft applications. Backed by NSK's precision-bearing engineering heritage.](https://www.mrosupply.com/products/5032851/as-markdown/)
- [FAG 51228 single direction thrust ball bearing with 140mm bore and 200mm OD. Designed for axial loads in one direction, this bearing offers reliable performance in vertical shaft applications. Precision-ground raceways ensure smooth operation. Suitable for moderate-speed industrial machinery.](https://www.mrosupply.com/products/2171531/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.