# NSK 6004DDU Sealed Deep Groove Ball Bearing - 20 mm Bore, Double Sealed - MROSupply.com

***NSK 6004DDU sealed deep groove ball bearing with 20 mm bore and 42 mm OD. Double contact rubber seals (DDU) on both sides exclude contaminants and retain grease. Suitable for electric motors, pumps, fans, and general industrial applications.***



## Product details:

- Catalog number: 6004DDU
- SKU: 5033209
- Price: ***$37.24*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NSK Bearings](https://www.mrosupply.com/brands/nsk-bearings/)
- Category: 
    - [6000 Series Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/6000-series-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.152 lb
- Returns: Yes


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



## Alternate products to `NSK 6004DDU Sealed Deep Groove Ball Bearing - 20 mm Bore, Double Sealed - MROSupply.com`:
- [SKF 6004 2RSJEM is a 20mm 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 for durability. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320048/as-markdown/)
- [NACHI 6004-2NSE9C3 Deep Groove Ball Bearing Single Row 20X42X12MM Two Seals Steel Cage C3 Clearance](https://www.mrosupply.com/products/207569/as-markdown/)
- [Koyo 6004 2RS is a 60 series single-row deep groove ball bearing with a 20 mm bore, 42 mm OD, and 12 mm width. Features double rubber seals and a steel cage. Suitable for electric motors, pumps, and general rotating machinery.](https://www.mrosupply.com/products/1494614/as-markdown/)
- [SKF 6004-2RSH/C3 deep groove ball bearing, 20mm bore, double sealed with low-friction NBR rubber seals on both sides. C3 greater-than-normal clearance. Pressed steel cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/2067847/as-markdown/)
- [SKF 6004-2RSH is a 20mm bore deep groove ball bearing with double low-friction NBR seals on both sides. It features a sheet metal cage and normal internal clearance. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/2067846/as-markdown/)
- [NSK 6004DDUC3 deep groove ball bearing with 20 mm bore. Double contact rubber seals (DDU) provide effective contamination protection, and C3 internal clearance accommodates thermal expansion. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5033210/as-markdown/)
- [Rollway 6004 2RS 20 mm Bore Size, 42 mm Outside Diameter, Radial Ball Bearing, Straight Bore, Sealed, 52100 Bearing Steel, Normal Radial Clearance](https://www.mrosupply.com/products/2301366/as-markdown/)
- [NTN 6004LLU is a 60 series single-row deep groove ball bearing with a 20 mm straight bore. It features double rubber contact seals (NBR) for effective contaminant exclusion and a stamped steel cage. Suitable for electric motors, pumps, fans, and general rotating machinery.](https://www.mrosupply.com/products/280666/as-markdown/)

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




## 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.