# Koyo 5311 Double-Row Angular Contact Ball Bearing - 55 mm Bore, 120 mm OD, 49.2 mm Width, Open Type - MROSupply.com

***Koyo 5311 double-row angular contact ball bearing with 55 mm bore, 120 mm OD, and 49.2 mm width. Open type design accommodates combined radial and axial loads in both directions. Suitable for pumps, compressors, and gearboxes.***



## Product details:

- Catalog number: 5311
- SKU: 1494559
- Price: ***$144.17*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Koyo Bearing](https://www.mrosupply.com/brands/koyo-bearing/)
- Category: 
    - [Double Row Angular Contact Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/double-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: 2.340 lb
- UPC: 60579003915


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


## Product attributes;

  
- Bore: 2.165 in / 55 mm
  

  
- Brand: KOYO
  

  
- Contact Angle: 24 Degree
  

  
- Flush Ground: No
  

  
- Harmonized Tariff Code: 8482.10.50.28
  

  
- Inch - Metric: Metric
  

  
- Internal Clearance: C0-Medium
  

  
- Maximum Capacity / Filling Slot: No
  

  
- Number of Bearings: 1 (Single)
  

  
- Number of Rows of Balls: Double Row
  

  
- Outside Diameter: 4.724 Inch / 120 Millimeter
  

  
- Precision Class: ABEC 1 / ISO P0
  

  
- Rolling Element: Ball Bearing
  

  
- Snap Ring: No
  

  
- Type: Angular Contact Ball Bearings
  

  
- UNSPSC: 31171531
  

  
- Width: 1.937 Inch / 49.2 Millimeter
  
## Product documents / software:

- [drawing](https://documents.mrosupply.com/product_documents/52/5207/010_1.jpg)
## Alternate products to `Koyo 5311 Double-Row Angular Contact Ball Bearing - 55 mm Bore, 120 mm OD, 49.2 mm Width, Open Type - MROSupply.com`:
- [Nachi Bearing 5311 Double Row Angular Contact Ball Bearing Open 20](https://www.mrosupply.com/products/208436/as-markdown/)
- [SKF 3311 E/C3 55mm bore double-row angular contact ball bearing with C3 clearance and an enhanced steel cage. Designed to carry combined radial and axial loads in both directions, it is suitable for pumps, gearboxes, and industrial machinery.](https://www.mrosupply.com/products/2069115/as-markdown/)
- [NTN 5311 double-row angular contact ball bearing with 55 mm straight bore. Open design without seals or shields. Double-row configuration provides high radial and axial load capacity in a compact assembly. Suitable for pumps, electric motors, and gearboxes.](https://www.mrosupply.com/products/284062/as-markdown/)
- [SKF 3311 A is a 55mm bore double-row angular contact ball bearing with a 30° contact angle. It features a sheet metal cage and is constructed from bearing steel. Designed to accommodate combined radial and axial loads in both directions, this bearing is suitable for pumps, gearboxes, and industrial machinery.](https://www.mrosupply.com/products/315781/as-markdown/)
- [Rollway 3311 C3 55 mm Bore Size, 120 mm Outside Diameter, Angular Contact Ball Bearing, Double Row, Straight Bore, 52100 Bearing Steel, C3 Radial Clearance](https://www.mrosupply.com/products/2889825/as-markdown/)
- [SKF 3311 A/C3 double-row angular contact ball bearing, 55mm bore, 90mm OD, 30° contact angle, C3 clearance, sheet metal cage. Bearing steel construction. Designed for combined radial and axial loads in both directions, suitable for pumps, gearboxes, and industrial machinery.](https://www.mrosupply.com/products/2066249/as-markdown/)
- [NTN 3311C3 33 series double-row angular contact ball bearing with 55 mm straight bore. Open type design with C3 clearance accommodates thermal expansion. Suitable for pumps, compressors, and gearboxes requiring high axial and radial load capacity.](https://www.mrosupply.com/products/281540/as-markdown/)
- [NTN 5311C3 double-row angular contact ball bearing with 55 mm straight bore, open enclosure, steel cage, and C3 radial internal clearance. High carbon chrome steel construction for moderate-speed, moderate-load applications including pumps, compressors, and gearboxes.](https://www.mrosupply.com/products/280967/as-markdown/)

## Product's reviews:
- Koyo roller bearing inner ring - Good product.
- Great service - great items at great price
- Admin assistance - good product!




## 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.