# Koyo 6308 2RD Deep Groove Ball Bearing - 40 mm Bore, 90 mm OD, Medium Series - MROSupply.com

***Koyo 6308 2RD is a 63 series single-row deep groove ball bearing with a 40 mm straight bore, 90 mm outside diameter, and 23 mm width. This medium-series bearing is designed for radial and moderate axial loads in electric motors, pumps, fans, and general industrial rotating equipment.***



## Product details:

- Catalog number: 6308 2RD
- SKU: 1494944
- Price: ***$55.58*** 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: 0.602 lb
- UPC: 60579007603


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


## Product attributes;

  
- Bore: 23
  

  
- I.D.: 40 mm
  

  
- O.D.: 90 mm
  

## Alternate products to `Koyo 6308 2RD Deep Groove Ball Bearing - 40 mm Bore, 90 mm OD, Medium Series - MROSupply.com`:
- [SKF 6308 2RSJEM is a 40mm 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/320666/as-markdown/)
- [SKF 6308-2RS1 deep groove ball bearing, 40mm bore, 80mm OD, 23mm width, double sealed with NBR rubber seals on both sides. Sheet metal cage, normal internal clearance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/319500/as-markdown/)
- [Koyo 6308 2RS is a 63 series single-row deep groove ball bearing with a 40 mm straight bore. Features double rubber seals and a steel cage. The bearing has a 90 mm outside diameter and a 23 mm width. Designed for electric motors, pumps, fans, and general rotating machinery.](https://www.mrosupply.com/products/1494945/as-markdown/)
- [SKF-Bearing 6308-2RS1/C3](https://www.mrosupply.com/products/320344/as-markdown/)
- [NSK 6308DDU sealed deep groove ball bearing with 40 mm bore and 90 mm OD. Double contact rubber seals (DDU) on both sides exclude contaminants and retain grease. Pressed steel cage, normal (CN) clearance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034216/as-markdown/)
- [NSK 6308DDUC3 deep groove ball bearing with 40 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/5034217/as-markdown/)
- [NTN 6308LLUC3/EM is a 63 series single-row deep groove ball bearing with a 40 mm straight bore. It features double contact rubber seals (LLU), a machined brass cage, and C3 internal clearance. Constructed from high carbon chrome steel, this bearing is designed for electric motors, pumps, fans, and general rotating machinery.](https://www.mrosupply.com/products/278835/as-markdown/)
- [Rollway 6308 2RS EMQ BALL 16000-61800-62200-62300](https://www.mrosupply.com/products/2890163/as-markdown/)

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




## 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.