# NSK 6311DDUC3 Sealed Deep Groove Ball Bearing - 55 mm Bore, Double Sealed, C3 Clearance - MROSupply.com

***NSK 6311DDUC3 deep groove ball bearing with 55 mm bore. Double contact rubber seals (DDU) provide contamination protection, and C3 internal clearance accommodates thermal expansion. Suitable for electric motors, pumps, fans, and general industrial applications.***



## Product details:

- Catalog number: 6311DDUC3
- SKU: 5034281
- Price: ***$190.96*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NSK Bearings](https://www.mrosupply.com/brands/nsk-bearings/)
- Category: 
    - [6300 Series Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/6300-series-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 3.082 lb
- Returns: Yes


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



## Alternate products to `NSK 6311DDUC3 Sealed Deep Groove Ball Bearing - 55 mm Bore, Double Sealed, C3 Clearance - MROSupply.com`:
- [SKF 6311 2RSJEM is a 55mm bore deep groove ball bearing, double sealed with NBR rubber seals on both sides. It features C3 greater-than-normal clearance and a machined brass cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320594/as-markdown/)
- [NACHI 6311-2NSEC3 Deep Groove Ball Bearing Single Row 55X120X29MM Two Seals Steel Cage C3 Clearance](https://www.mrosupply.com/products/208132/as-markdown/)
- [SKF 6311-2RS1/C3 deep groove ball bearing, 55mm bore, double sealed with NBR rubber seals on both sides, C3 clearance. Sheet metal cage, bearing steel construction. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/320358/as-markdown/)
- [NTN 6311LLUC3/EM is a 63 series single-row deep groove ball bearing with a 55 mm straight bore. It features double contact rubber seals (NBR) for contamination protection, C3 internal clearance for thermal expansion, and a machined brass cage for high-speed and heavy-load applications. Suitable for electric motors, pumps, fans, and general industrial machinery.](https://www.mrosupply.com/products/278740/as-markdown/)
- [Rollway 6311 2RS C3 EMQ BALL 16000-61800-62200-62300](https://www.mrosupply.com/products/2890175/as-markdown/)
- [Koyo 6311 2RDT is a 63 series single-row deep groove ball bearing with a 55 mm straight bore. It features double rubber seals for contaminant protection. Designed for electric motors, pumps, fans, and general industrial rotating equipment.](https://www.mrosupply.com/products/1494971/as-markdown/)
- [FAG 6311.2RSR.C3 deep groove ball bearing with 55mm bore and 120mm OD. Double sealed for contamination protection, C3 internal clearance for thermal expansion. Suitable for high-speed applications requiring low maintenance. Precision German engineering from Schaeffler.](https://www.mrosupply.com/products/2176118/as-markdown/)

## Product's reviews:
- Purchasing specialist - Great!!!
- Sales - Great Service !!
- Had what i needed - Found the bearing I needed. Reasonable price. Great phone support.




## 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.