# AMI UCF309-28 Four-Bolt Flange Bearing 1-3/4" (44.45mm) Bore Set Screw Locking Heavy Duty Cast Iron 300 Series - MROSupply.com

***AMI UCF309-28 four-bolt flange bearing unit with 1-3/4" bore, set screw locking, and heavy duty cast iron housing. Features chrome steel insert with wide inner ring for demanding industrial applications. 300 series construction.***



## Product details:

- Catalog number: UCF309-28
- SKU: 6054
- Price: ***$164.83*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [AMI Bearings](https://www.mrosupply.com/brands/ami-bearings/)
- Category: 
    - [4-Bolt Flange](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/flanged-mounted-bearings/4-bolt-flange/)
    - [Flanged Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/flanged-mounted-bearings/)
    - [Mounted Ball Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-ball-bearings/)
    - [Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 7.960 lb
- Technicall support: contact supplier for technical support on 800 882 8642


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


## Product attributes;

  
- Application: General Purpose
  

  
- Bearing: UC309-28
  

  
- Bolt Size: 5/8
  

  
- Covers: No
  

  
- Duty: Heavy
  

  
- Expansion: No
  

  
- High Temp: 212f
  

  
- Housing: Cast iron
  

  
- Housing Style: F309
  

  
- HTS code: 8483.20.40.40
  

  
- I.D.: 1 3/4 in
  

  
- Inner Ring Width: Wide
  

  
- Insert Material: Bearing steel
  

  
- Insert Type: Ball Bearing
  

  
- Locking: Set screw
  

  
- Lubrication Fitting Tap: 1/8-27 NPT
  

  
- Relubrication: Yes
  

  
- Seal: Contact Seal with Slinger
  

  
- Type: 4 Bolt Flange
  
## Product documents / software:

- [drawing](https://documents.mrosupply.com/product_documents/UC/UCF328/UCF300dwg.jpg)

## Product's reviews:
- In stock ! - Twice now they have had the bearings in needed in stock, with prompt delivery!
- Great job - Had my bearings in stock and shipped right away.
- Ami bearings - I've been using AMI bearings for several years now and have had zero problems. There made in Japan, so seem remarkably high quality but half the price of NTN.
- Quality exactly as expected - Fair price for the product, quick lead time, good service.




## 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.