# Koyo M-661 Full Complement Drawn Cup Needle Roller Bearing - 0.3774" ID x 0.563" OD x 0.375" W, Open Type - MROSupply.com

***Koyo M-661 full complement drawn cup needle roller bearing, open type, with 0.3774" inner diameter, 0.563" outer diameter, and 0.375" width. This bearing uses a full complement of needle rollers for maximum load capacity in a compact radial design. Suitable for oscillating and rotating applications with limited space.***



## Product details:

- Catalog number: M-661
- SKU: 1497077
- Price: ***$6.74*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Koyo Bearing](https://www.mrosupply.com/brands/koyo-bearing/)
- Category: 
    - [Full Complement Needle Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/needle-roller-bearings/full-complement-needle-roller-bearings/)
    - [Needle Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/needle-roller-bearings/)
    - [Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 0.013 lb
- UPC: 60579020914


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


## Product attributes;

  
- Bearing Design: Outer Ring & Roller Assembly
  

  
- Housing Bore [MAX]: 0.563 in
  

  
- Housing Bore [MIN]: 0.562 in
  

  
- I.D.: 3/8 in
  

  
- Limiting Speed - Oil: 7100 rpm
  

  
- O.D.: 9/16 in
  

  
- Oil Hole: w/o Oil Hole
  

  
- Origin: Needle Radial
  

  
- Precision Ground: No
  

  
- Self Aligning: No
  

  
- Width: 3/8 in
  

  
- Working Load: 944 lbf
  


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