# NTN 21311KW33 Spherical Roller Bearing - 55 mm Bore, Brass Cage, Open, W33 Lube Groove - MROSupply.com

***NTN 21311KW33 is a 213 series spherical roller bearing with a 55 mm straight bore. It features an open enclosure, brass cage, and W33 annular lube groove with three lubrication holes. Constructed from through hardened steel, it is designed for heavy-duty industrial applications such as gearboxes, conveyors, and vibrating screens.***



## Product details:

- Catalog number: 21311KW33
- SKU: 2170788
- Price: ***$265.01*** 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 Spherical Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/spherical-roller-bearings/straight-round-bore-spherical-roller-bearings/)
    - [Spherical Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/spherical-roller-bearings/)
    - [Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 3.549 lb
- UPC: 4550253101284


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


## Product attributes;

  
- B (in): 1.1417
  

  
- Bore type: Tapered
  

  
- Bore Type: Tapered
  

  
- Cage material: Steel
  

  
- Cage Material: Steel
  

  
- Cage type: Machined
  

  
- Cage Type: Machined
  

  
- D (in): 4.7244
  

  
- d (in): 2.1654
  

  
- d0: 0.1181 in
  

  
- Da max: 4.3307 in
  

  
- da min: 2.5591 in
  

  
- e: 0.25
  

  
- Enclosure: Open
  

  
- I.D.: 55 mm
  

  
- Material: Through Hardened Steel
  

  
- O.D.: 120 mm
  

  
- r (in): 0.0787
  

  
- Radial internal clearance: CN
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance specification: Normal
  

  
- Radial Internal Clearance Specification: Normal
  

  
- ras max: 0.0787 in
  

  
- Ring modification: Relube
  

  
- Ring Modification: Relube
  

  
- Series: 213
  

  
- Taper: 1:12
  

  
- Type: Spherical Roller Bearing
  

  
- W0: 0.4724 in
  

  
- Y0: 2.63
  

  
- Y1: 2.69
  

  
- Y2: 4.01
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/49/5049077/1127_S_PmbuUjR.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.