# NTN 51111 Thrust Ball Bearing - 55 mm Bore, Single Direction, Straight Bore - MROSupply.com

***NTN 51111 is a single-direction thrust ball bearing with a 55 mm straight bore. Part of the 51 series, it accommodates axial loads in one direction and is designed for low-speed, moderate-load applications such as machine tool spindles, clutches, and rotary tables.***



## Product details:

- Catalog number: 51111
- SKU: 283320
- Price: ***$82.43*** 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: 0.496 lb


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


## Product attributes;

  
- Height: 3.071
  

  
- I.D.: 55 mm
  

  
- Length: 3.071
  

  
- O.D.: 78 mm
  

  
- Width: 0.6299
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048886/1264_S_mICK0xq.png)
- [Drawing 1264_S](https://documents.mrosupply.com/product_documents/28/33/283325/1264_S.png)
## Alternate products to `NTN 51111 Thrust Ball Bearing - 55 mm Bore, Single Direction, Straight Bore - MROSupply.com`:
- [Rollway 51111 55 mm Bore Size, 78 mm Outside Diameter, Thrust Ball Bearing, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2302265/as-markdown/)
- [NSK 51111 thrust ball bearing with 55 mm bore. Designed for pure axial loads in vertical-shaft applications. Backed by NSK's precision-bearing engineering heritage.](https://www.mrosupply.com/products/5032804/as-markdown/)
- [FAG 51111 single direction thrust ball bearing with 12mm bore and 28mm OD. Designed for axial loads in one direction, this bearing offers reliable performance in vertical shaft applications. Manufactured by Schaeffler, it meets ISO precision standards for industrial use.](https://www.mrosupply.com/products/2171490/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.