# NTN 51308P5 Thrust Ball Bearing - 40 mm Bore, Single Direction, Precision P5 - MROSupply.com

***NTN 51308P5 single direction thrust ball bearing with 40 mm bore. Straight bore design with precision P5 tolerance class. Designed for axial loads in one direction in machine tool spindles, gearboxes, and industrial drives.***



## Product details:

- Catalog number: 51308P5
- SKU: 281298
- Price: ***$176.69*** 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: 1.168 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): 1.5748
  

  
- D (in): 3.0709
  

  
- d1: 3.0709 in
  

  
- D1: 1.6535 in
  

  
- Da max: 2.4803 in
  

  
- da min: 2.4803 in
  

  
- Dynamic Load Rating: 15500 lbf
  

  
- Dynamic load rating: 15500 lbf
  

  
- Enclosure: Open
  

  
- I.D.: 40 mm
  

  
- Limiting Speed - Grease: 2200 RPM
  

  
- Limiting speed - grease: 2200 RPM
  

  
- Limiting Speed - Oil: 3100 RPM
  

  
- Limiting speed - oil: 3100 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 5
  

  
- 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: 30500 lbf
  

  
- Static load rating: 30500 lbf
  

  
- T (in): 1.0236
  

  
- Type: Thrust Ball Bearing
  
## 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.