# Koyo 6304 2RS Deep Groove Ball Bearing - 20 mm Bore, Double Sealed, Steel Cage - MROSupply.com

***Koyo 6304 2RS is a 63 series single-row deep groove ball bearing with a 20 mm bore, 52 mm OD, and 15 mm width. Double rubber seals (2RS) provide protection against contaminants. Steel cage. Used in electric motors, pumps, and general rotating machinery.***



## Product details:

- Catalog number: 6304 2RS
- SKU: 1494911
- Price: ***$20.95*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Koyo Bearing](https://www.mrosupply.com/brands/koyo-bearing/)
- Category: 
    - [Single Row Angular Contact Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/single-row-angular-contact-bearings/)
    - [Angular Contact Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/angular-contact-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.149 lb
- UPC: 60579007270


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


## Product attributes;

  
- Bore: 0.787 in / 20 mm
  

  
- Brand: KOYO
  

  
- Enclosure Type: Contact Seal
  

  
- Harmonized Tariff Code: 8482.10.50.68
  

  
- Inch - Metric: Metric
  

  
- Inner Race Width: 0 Inch / 0 Millimeter
  

  
- Internal Clearance: C0-Medium
  

  
- Internal Special Features: No
  

  
- Maximum Capacity / Filling Slot: No
  

  
- Other Features: Deep Groove
  

  
- Outer Race Width: 0.591 Inch / 15 Millimeter
  

  
- Outside Diameter: 2.047 Inch / 52 Millimeter
  

  
- Precision Class: ABEC 1 / ISO P0
  

  
- Rolling Element: Ball Bearing
  

  
- Snap Ring: No
  

  
- Type: Single Row Ball Bearings
  

  
- UNSPSC: 31171504
  

## Alternate products to `Koyo 6304 2RS Deep Groove Ball Bearing - 20 mm Bore, Double Sealed, Steel Cage - MROSupply.com`:
- [NACHI 6304-2NSE9C3 Deep Groove Ball Bearing Single Row 20X52X15MM Two Seals Steel Cage C3 Clearance](https://www.mrosupply.com/products/207621/as-markdown/)
- [SKF 6304 2RSJEM is a 20mm bore deep groove ball bearing with double contact seals (NBR), C3 clearance, and a machined brass cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320122/as-markdown/)
- [SKF 6304-2RSH 20mm bore deep groove ball bearing, double sealed with low-friction NBR rubber seals on both sides. It features a pressed steel cage and normal internal clearance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/2068061/as-markdown/)
- [NSK 6304DDU sealed deep groove ball bearing with 20 mm bore and 52 mm OD. Double contact rubber seals (DDU) on both sides retain lubricant and exclude contaminants. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034134/as-markdown/)
- [NTN 6304LLU 63 series single-row deep groove ball bearing with 20 mm straight bore, double rubber contact seals (NBR), and stamped steel cage. Designed for electric motors, pumps, fans, and general rotating machinery requiring reliable contaminant exclusion.](https://www.mrosupply.com/products/278993/as-markdown/)
- [SKF 6304-2RSH/C3 20mm bore deep groove ball bearing, double sealed with low-friction NBR rubber seals on both sides. It features C3 greater-than-normal clearance and a pressed steel cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/5830210/as-markdown/)
- [Rollway 6304 2RS EMQ BALL 16000-61800-62200-62300](https://www.mrosupply.com/products/2890153/as-markdown/)
- [NTN 6304LLUAC3 63 series single-row deep groove ball bearing with 20 mm straight bore, double rubber contact seals (NBR), stamped steel cage, and C3 internal clearance. Suitable for electric motors, pumps, and general industrial machinery.](https://www.mrosupply.com/products/830509/as-markdown/)

## Product's reviews:
- Admin assistance - good product!
- Koyo roller bearing inner ring - Good product.
- Great service - great items at great price




## 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.