# Koyo 6309 Deep Groove Ball Bearing - 45 mm Bore, Open Type, 100 mm OD - MROSupply.com

***Koyo 6309 is a 63 series single-row deep groove ball bearing with a 45 mm bore, 100 mm OD, and 25 mm width. Open type design with straight bore. Suitable for electric motors, pumps, fans, and general rotating machinery.***



## Product details:

- Catalog number: 6309
- SKU: 1494952
- Price: ***$68.74*** 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: 0.843 lb
- UPC: 60579007653


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


## Product attributes;

  
- Bore: 1.772 in / 45 mm
  

  
- Brand: KOYO
  

  
- Harmonized Tariff Code: 8482.10.50.68
  

  
- Inch - Metric: Metric
  

  
- Internal Clearance: C0-Medium
  

  
- Internal Special Features: No
  

  
- Manufacturer Item Number: 6309
  

  
- Maximum Capacity / Filling Slot: No
  

  
- Outer Race Width: 0.984 Inch / 25 Millimeter
  

  
- Outside Diameter: 3.937 Inch / 100 Millimeter
  

  
- Precision Class: ABEC 1 / ISO P0
  

  
- Rolling Element: Ball Bearing
  

  
- Snap Ring: No
  

  
- Type: Single Row Ball Bearings
  

  
- UNSPSC: 31171504
  
## Product documents / software:

- [drawing](https://documents.mrosupply.com/product_documents/68/6802/010_1.jpg)
## Alternate products to `Koyo 6309 Deep Groove Ball Bearing - 45 mm Bore, Open Type, 100 mm OD - MROSupply.com`:
- [SKF 6309/C3 deep groove ball bearing, 45mm bore, 3.937 in OD, 1.772 in ID. Open design with C3 greater-than-normal clearance and sheet metal cage. Suitable for electric motors, pumps, and general industrial applications where increased clearance accommodates thermal expansion or interference fits.](https://www.mrosupply.com/products/319659/as-markdown/)
- [Nachi Bearing 6309C3 Deep Groove Ball Bearing Open](https://www.mrosupply.com/products/207924/as-markdown/)
- [SKF 6309 JEM deep groove ball bearing, 45mm bore, 3.937 in OD, with a machined brass cage and C3 clearance. This open bearing is designed for high-speed operation and moderate radial and axial loads. Suitable for electric motors, pumps, and general industrial machinery.](https://www.mrosupply.com/products/319930/as-markdown/)
- [NTN 6309C3 is a 63 series single-row deep groove ball bearing with a 45 mm straight bore. It is open (no seals or shields) and features C3 internal clearance for applications requiring thermal expansion accommodation. Used in electric motors, pumps, fans, and general industrial rotating machinery.](https://www.mrosupply.com/products/278810/as-markdown/)
- [NSK 6309C3 single-row deep groove ball bearing with 45 mm bore and C3 clearance. Open design with pressed steel cage. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034235/as-markdown/)
- [FAG 6309.C3 deep groove ball bearing with 50mm bore and 110mm OD. Features C3 internal clearance for applications requiring higher operating temperatures or interference fits. Suitable for high-speed and radial load applications.](https://www.mrosupply.com/products/2176080/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.