# NTN NN3028KC1NAP4 Double Row Cylindrical Roller Bearing - 140 mm Bore, Open, Machined Brass Cage, P4 Precision - MROSupply.com

***NTN NN3028KC1NAP4 double row cylindrical roller bearing with a 140 mm bore. This NN-type bearing has no flanges on the outer ring, allowing axial expansion. It features a high-strength two-piece machined brass cage and is open (unsealed). Constructed from hardened alloy steel, it is suitable for high-speed and high-precision applications such as machine tool spindles.***



## Product details:

- Catalog number: NN3028KC1NAP4
- SKU: 272054
- Price: ***$2,049.82*** 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: 13.395 lb
- UPC: 4547359132373


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


## Product attributes;

  
- B (in): 2.0866
  

  
- Bore Type: Tapered
  

  
- Bore type: Tapered
  

  
- C (in): 2.0866
  

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

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

  
- Configuration: Two
  

  
- D (in): 8.2677
  

  
- d (in): 5.5118
  

  
- Da max: 7.6378 in
  

  
- da min: 5.8661 in
  

  
- Db max: 7.9134 in
  

  
- db min: 6.0236 in
  

  
- Db min: 7.6378 in
  

  
- Dynamic Load Rating: 67000 lbf
  

  
- Dynamic load rating: 67000 lbf
  

  
- Enclosure: Open
  

  
- Ew: 7.5591 in
  

  
- I.D.: 140 mm
  

  
- Limiting Speed - Grease: 2800 RPM
  

  
- Limiting speed - grease: 2800 RPM
  

  
- Limiting Speed - Oil: 3300 RPM
  

  
- Limiting speed - oil: 3300 RPM
  

  
- Material: Hardened alloy steel
  

  
- O.D.: 210 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 4
  

  
- r (in): 0.0787
  

  
- Radial Internal Clearance: C1NA
  

  
- Radial internal clearance: C1NA
  

  
- ras max: 0.0787 in
  

  
- Static Load Rating: 116000 lbf
  

  
- Static load rating: 116000 lbf
  

  
- Taper: 1 to 12
  

  
- Type: Cylindrical Roller Bearing
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048540/1324_S_0BlDpF4.png)
- [2D Sectional View PDF](https://documents.mrosupply.com/product_documents/NN/NN3028KC1NAP4/bearingfinder_2d_pdf_fixed_NN3028KC1NAP4_cpa9R3Z.pdf)






## 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.