# NTN 6904LLU Deep Groove Ball Bearing - 20 mm Bore, Double Sealed - MROSupply.com

***NTN 6904LLU 6900 series single-row deep groove ball bearing, 20 mm straight bore, double contact rubber seals (LLU) for contaminant exclusion. Designed for light-duty applications including small electric motors, instruments, and hand tools.***



## Product details:

- Catalog number: 6904LLU
- SKU: 278170
- Price: ***$8.15*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [6900 Series Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/6900-series-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.069 lb


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


## Product attributes;

  
- B (in): 0.3543
  

  
- Ball Material: Steel
  

  
- Ball material: Steel
  

  
- Bore Type: Round
  

  
- Bore type: Round
  

  
- Cage Material: Steel
  

  
- Cage material: Steel
  

  
- Cage Type: Pressed
  

  
- Cage type: Pressed
  

  
- Configuration: One
  

  
- D (in): 1.4567
  

  
- d (in): 0.7874
  

  
- da max: 0.9449 in
  

  
- Da max: 1.3780 in
  

  
- Dynamic Load Rating: 1580 lbf
  

  
- Dynamic load rating: 1580 lbf
  

  
- Enclosure: Double Sealed
  

  
- Factor: 14.7
  

  
- I.D.: 20 mm
  

  
- Limiting Speed - Grease: 12000 RPM
  

  
- Limiting speed - grease: 12000 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 37 mm
  

  
- Operating Temperature Range: -40 to 250 °F
  

  
- Operating temperature range: -40 to 250 ºF
  

  
- Precision: ISO class 0
  

  
- r (in): 0.0118
  

  
- r1: 0.0118 in
  

  
- Radial Internal Clearance: CN
  

  
- Radial internal clearance: CN
  

  
- ras max: 0.0118 in
  

  
- Seal Material: Nitrile Rubber
  

  
- Seal material: Nitrile rubber
  

  
- Seal Type: Contact
  

  
- Seal type: Contact
  

  
- Static Load Rating: 830 lbf
  

  
- Static load rating: 830 lbf
  

  
- Type: Deep Groove Ball Bearing
  
## Product documents / software:

- [Drawing](https://documents.mrosupply.com/product_documents/50/48/5048532/1568_S_Yj9mebj.png)
## Alternate products to `NTN 6904LLU Deep Groove Ball Bearing - 20 mm Bore, Double Sealed - MROSupply.com`:
- [SKF 61904-2RS1 is a 20mm bore deep groove ball bearing, double sealed with NBR rubber seals on both sides. It features a sheet metal cage and is made of standard bearing steel. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/326374/as-markdown/)
- [Koyo 6904 ZZ deep groove ball bearing with 20 mm bore, 37 mm OD, and 9 mm width. Double shielded with steel shields for contaminant protection. Single-row radial design for electric motors, pumps, and general industrial rotating equipment.](https://www.mrosupply.com/products/1495169/as-markdown/)
- [NSK 6904ZZ shielded deep groove ball bearing with 20 mm bore and 37 mm OD. Double metal shields (ZZ) protect against contaminants. Pressed steel cage. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034631/as-markdown/)
- [NSK 6904DDU deep groove ball bearing with 20 mm bore and 37 mm OD. Double contact rubber seals (DDU) provide effective contaminant exclusion. Pressed steel cage. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034628/as-markdown/)
- [NTN 6904ZZ 6900 series single-row deep groove ball bearing with a 20 mm straight bore. Double steel shields protect against contaminants. Designed for general industrial rotating equipment such as electric motors, pumps, and fans.](https://www.mrosupply.com/products/278167/as-markdown/)
- [FAG 61904-2RSR-HLC is a Generation C deep groove ball bearing with a 20mm bore. It features double sealed (2RSR) contact seals for effective lubricant retention and contamination protection. The HLC suffix indicates a high-load-capacity design. This bearing is suitable for applications requiring reliable performance and extended service life.](https://www.mrosupply.com/products/2175355/as-markdown/)
- [Nachi Bearing 6904ZZECM Deep Groove Ball Bearing with 2 Shields](https://www.mrosupply.com/products/5900143/as-markdown/)
- [FAG 61904-2Z-HLC is a Generation C deep groove ball bearing with a 20mm bore. It features double shielded enclosure for protection against contaminants. This bearing is designed for high-speed applications and offers reduced noise and vibration. The Generation C design provides optimized internal geometry for extended service life.](https://www.mrosupply.com/products/2175356/as-markdown/)






## 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.