# SKF QJ 311 N2MA/C3 Four-Point Angular Contact Ball Bearing 55mm Bore C3 Clearance Machined Brass Cage - MROSupply.com

***SKF QJ 311 N2MA/C3 four-point angular contact ball bearing, 55mm bore, 120mm OD, 29mm width. C3 clearance, machined brass cage. Designed for combined radial and axial loads in both directions. Suitable for pumps, compressors, and industrial gearboxes.***



## Product details:

- Catalog number: QJ 311 N2MA/C3
- SKU: 314057
- Price: ***$481.39*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [SKF Bearing](https://www.mrosupply.com/brands/skf-bearing/)
- Category: 
    - [Four Point Contact Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/four-point-contact-ball-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: 3.783 lb


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


## Product attributes;

  
- Axial Internal Clearance: C3
  

  
- Basic Dynamic Load Rating: 137 kN
  

  
- Basic Static Load Rating: 118 kN
  

  
- Bearing Material: Bearing steel
  

  
- Bearing Outer Ring Locating Feature: Locating slot
  

  
- Bore Diameter: 55 mm
  

  
- Cage: Machined (solid)
  

  
- Coating: Without
  

  
- Contact Angle: 35.000000000087 °
  

  
- Contact Type: Four-point contact
  

  
- Dimension Type: Metric
  

  
- Inner Diameter (mm): 55.000
  

  
- Limiting Speed: 10000 r/min
  

  
- Lubricant: None
  

  
- Lubricant (in Bearing): None
  

  
- Matched Arrangement: No
  

  
- Material/Treatment: Bearing steel
  

  
- Number of Rows: 1
  

  
- O.D. (in): 4 5/7
  

  
- Outer Diameter (mm): 120.000
  

  
- Pack Height: 126 mm
  

  
- Pack Length: 124 mm
  

  
- Pack Width: 33 mm
  

  
- Relubrication Feature: Without
  

  
- Ring Type: Two-piece inner ring
  

  
- Sealing: None
  

  
- SKF Performance Class: SKF Explorer
  

  
- Type: Four-point contact
  

  
- Universal Matching Bearing: No
  

  
- Width: 29 mm
  

  
- Width (mm): 29.000
  


## Product's reviews:
- Bearing - Old hard to find bearing for a 85 year old tractor. Fit perfect and price was great.
- Agradecimiento. - Excelente servicio, confiable, rápido y efectivo.
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- Sales - GREAT PRODUCT CUSTOMER WILL PURCHASE AGAIN.
- Buyer - perfect sevice




## 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.