# Timken 303K Deep Groove Ball Bearing, <12 in OD, 3450 lbf Dynamic Load - MROSupply.com

***Timken 303K is a deep groove radial ball bearing from the Fafnir line, designed for general industrial applications. It features a standard radial internal clearance and is suitable for electric motors, pumps, and HVAC equipment. The bearing has a dynamic load rating of 3450 lbf and a static load rating of 1460 lbf, with an outer diameter class under 12 inches.***



## Product details:

- Catalog number: 303K
- SKU: 5079652
- Price: ***$20.69*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Timken](https://www.mrosupply.com/brands/timken/)
- Category: 
    - [Single Row Angular Contact Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/single-row-angular-contact-bearings/)
    - [Angular Contact Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.240 lb
- Returns: Yes


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


## Product attributes;

  
- Ball diameter: 0.34375 in
  

  
- Ball type: Steel
  

  
- Bearing width: 0.5512 in
  

  
- Design units: METRIC
  

  
- Dynamic radial rating: 3450 lbf
  

  
- I.D.: 0.6693 in
  

  
- Inner ring "to clear" radius: 0.039 in
  

  
- Inner ring backing diameter: 0.830 in
  

  
- Limiting speed (grease): 9370 rpm
  

  
- Limiting speed (oil): 10940 rpm
  

  
- O.D.: 1.8504 in
  

  
- Outer ring "to clear" radius: 0.039 in
  

  
- Outer ring backing diameter: 1.610 in
  

  
- Static radial rating: 1460 lbf
  
## Product documents / software:

- [Fafnir Deep Groove Ball Bearings 9100k 200k](https://documents.mrosupply.com/product_documents/50/79/5079652/303k_IwFzRGq)

## Product's reviews:
- Best company to buy from - I always buy from MRO is a very reliable company to work with




## 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.