# NTN 51101 Thrust Ball Bearing - 12 mm Bore, Single Direction, Straight Bore - MROSupply.com

***NTN 51101 single direction thrust ball bearing with a 12 mm straight bore. Designed for axial loads in one direction, this bearing features a flat raceway and is suitable for low-speed, moderate-load applications such as machine tool spindles and automotive transmissions.***



## Product details:

- Catalog number: 51101
- SKU: 283330
- Price: ***$10.27*** 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: 0.046 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: Resin
  

  
- Cage material: Resin
  

  
- Cage Type: Molded
  

  
- Cage type: Molded
  

  
- Configuration: One
  

  
- D (in): 1.0236
  

  
- d (in): 0.4724
  

  
- D1: 0.5118 in
  

  
- d1: 1.0236 in
  

  
- Da max: 0.7874 in
  

  
- da min: 0.7874 in
  

  
- Dynamic Load Rating: 2320 lbf
  

  
- Dynamic load rating: 2320 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 12 mm
  

  
- Limiting Speed - Grease: 6400 RPM
  

  
- Limiting speed - grease: 6400 RPM
  

  
- Limiting Speed - Oil: 9200 RPM
  

  
- Limiting speed - oil: 9200 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 26 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): 0.0118
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- ras max: 0.0118 in
  

  
- Seal material: None
  

  
- Seal type: None
  

  
- Static Load Rating: 3450 lbf
  

  
- Static load rating: 3450 lbf
  

  
- T (in): 0.3543
  

  
- 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 51101 Thrust Ball Bearing - 12 mm Bore, Single Direction, Straight Bore - MROSupply.com`:
- [NSK 51101 thrust ball bearing with 12 mm bore. It features a pressed steel cage and is designed for pure axial loads in vertical-shaft applications. Backed by NSK's precision-bearing engineering heritage.](https://www.mrosupply.com/products/5032794/as-markdown/)
- [SKF 51101 is a 12mm 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, clutches, and general industrial applications.](https://www.mrosupply.com/products/320560/as-markdown/)
- [FAG 51101 single direction thrust ball bearing with 80mm bore and 105mm OD. Designed for axial loads in one direction, this bearing offers reliable performance in moderate-speed applications. Precision-ground raceways ensure smooth operation and long service life.](https://www.mrosupply.com/products/2171480/as-markdown/)
- [Rollway 51101 12 mm Bore Size, 26 mm Outside Diameter, Thrust Ball Bearing, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2302255/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.