# NTN 6903LLU Deep Groove Ball Bearing - 17 mm Bore, Double Sealed - MROSupply.com

***NTN 6903LLU is a single-row deep groove ball bearing with a 17 mm straight bore. It features double contact rubber seals for effective contaminant exclusion. This bearing is pre-greased and suitable for general industrial rotating equipment such as electric motors, pumps, and fans.***



## Product details:

- Catalog number: 6903LLU
- SKU: 278177
- Price: ***$6.51*** 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: 0.040 lb


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


## Product attributes;

  
- B (in): 0.2756
  

  
- 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): 1.1811
  

  
- d (in): 0.6693
  

  
- Da max: 1.1024 in
  

  
- da max: 0.7874 in
  

  
- Dynamic Load Rating: 1150 lbf
  

  
- Dynamic load rating: 1150 lbf
  

  
- Enclosure: Double Sealed
  

  
- Factor: 14.7
  

  
- I.D.: 17 mm
  

  
- Limiting Speed - Grease: 14000 RPM
  

  
- Limiting speed - grease: 14000 RPM
  

  
- Material: High carbon chrome steel
  

  
- O.D.: 30 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: 580 lbf
  

  
- Static load rating: 580 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 6903LLU Deep Groove Ball Bearing - 17 mm Bore, Double Sealed - MROSupply.com`:
- [SKF 61903-2RS1 is a 17mm bore deep groove ball bearing, double sealed with NBR rubber contact 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/326373/as-markdown/)
- [Nachi Bearing 6903-2NSE Deep Groove Ball Bearing with 2 Seals](https://www.mrosupply.com/products/5744953/as-markdown/)
- [NSK 6903DDU deep groove ball bearing with 17 mm bore and 30 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/5034623/as-markdown/)
- [Koyo 6903 2RU is a 69 series single-row deep groove ball bearing with a 17 mm bore, 30 mm OD, and 7 mm width. Double sealed with rubber seals for contaminant protection. Suitable for electric motors, pumps, and general rotating machinery.](https://www.mrosupply.com/products/1495165/as-markdown/)
- [NSK 6903VV deep groove ball bearing with 17 mm bore and 30 mm OD. Double non-contact rubber seals (VV) provide low-friction sealing, and a pressed steel cage ensures reliable operation. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034625/as-markdown/)
- [FAG 61903-2RSR-HLC is a Generation C deep groove ball bearing with a 17mm 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/2175351/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.