# NTN NNU4944C3 Double Row Cylindrical Roller Bearing - 220 mm Bore, Straight Bore, C3 Clearance - MROSupply.com

***NTN NNU4944C3 double-row cylindrical roller bearing with 220 mm straight bore. NNU design features flanges on the inner ring, allowing axial shaft expansion. C3 clearance accommodates thermal expansion in heavy machinery, gearboxes, and industrial equipment.***



## Product details:

- Catalog number: NNU4944C3
- SKU: 827141
- Price: ***$7,247.25*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [Straight / Round Bore Cylindrical Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/cylindrical-roller-bearings/straight-round-bore-cylindrical-roller-bearings/)
    - [Cylindrical Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/cylindrical-roller-bearings/)
    - [Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 37.258 lb


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


## Product attributes;

  
- B (in): 3.1496
  

  
- Bore Type: Cylindrical
  

  
- Bore type: Cylindrical
  

  
- C (in): 3.1496
  

  
- Cage Material: High Strength, 2 piece, Machined Brass
  

  
- Cage material: High strength, 2 piece, machined brass
  

  
- Configuration: Two
  

  
- d (in): 8.6614
  

  
- D (in): 11.8110
  

  
- Da max: 11.378 in
  

  
- da min: 9.0945 in
  

  
- Db max: 11.3780 in
  

  
- db min: 9.3701 in
  

  
- Db min: 11.1811 in
  

  
- Dynamic Load Rating: 132000 lbf
  

  
- Dynamic load rating: 132000 lbf
  

  
- Enclosure: Open
  

  
- Fw: 9.6457 in
  

  
- I.D.: 220 mm
  

  
- Limiting Speed - Grease: 1900 RPM
  

  
- Limiting speed - grease: 1900 RPM
  

  
- Limiting Speed - Oil: 2200 RPM
  

  
- Limiting speed - oil: 2200 RPM
  

  
- Material: Hardened alloy steel
  

  
- O.D.: 300 mm
  

  
- Oil Hole: w/o Oil Hole
  

  
- Oil hole: w/o Oil Hole
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Precision: ISO class 0
  

  
- r (in): 0.0827
  

  
- Radial Internal Clearance: C3
  

  
- Radial internal clearance: C3
  

  
- ras max: 0.0787 in
  

  
- Static Load Rating: 292000 lbf
  

  
- Static load rating: 292000 lbf
  

  
- Tolerance: ISO class 0 (RBEC 1)
  

  
- Type: Cylindrical Roller Bearing
  

  
- Width: 80 mm
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048727/1318_S_bdoS69x.png)
- [Drawing](https://documents.mrosupply.com/product_documents/NN/NNU4944C3/1318_S_QhMhgPI.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.