# NTN 6308Z Deep Groove Ball Bearing - 40 mm Bore, Single Shielded - MROSupply.com

***NTN 6308Z is a 63 series single-row deep groove ball bearing with a 40 mm straight bore. It features a single steel shield (Z) on one side for protection against contaminants while maintaining low friction. This bearing is suitable for electric motors, pumps, fans, and general rotating machinery.***



## Product details:

- Catalog number: 6308Z
- SKU: 278820
- Price: ***$72.77*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [NTN Bearing](https://www.mrosupply.com/brands/ntn-bearing/)
- Category: 
    - [6300 Series Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/6300-series-ball-bearings/)
    - [Ball Bearings](htts://www.mrosupply.com/bearings/ball-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 1.365 lb


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


## Product attributes;

  
- Clearance: CN
  

  
- Height: 3.543
  

  
- I.D.: 40 mm
  

  
- Length: 3.543
  

  
- Material: Steel
  

  
- O.D.: 90 mm
  

  
- Width: 0.9055
  

## Alternate products to `NTN 6308Z Deep Groove Ball Bearing - 40 mm Bore, Single Shielded - MROSupply.com`:
- [SKF 6308 2ZJEM 40mm bore deep groove ball bearing, double shielded with metal shields, C3 clearance, and a machined brass cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320345/as-markdown/)
- [SKF 6308-2Z/C3 deep groove ball bearing, 40mm bore, double shielded with steel shields on both sides. C3 greater-than-normal clearance. Sheet metal cage. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/319270/as-markdown/)
- [SKF 6308-2Z 40mm bore deep groove ball bearing, double shielded with metal shields 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/319350/as-markdown/)
- [SKF 6308-Z deep groove ball bearing, 40mm bore, 3.543 in OD, shielded one side with steel shield. Sheet metal cage, normal internal clearance. Bearing steel construction. Suitable for electric motors, pumps, and general industrial applications.](https://www.mrosupply.com/products/320754/as-markdown/)
- [NSK 6308ZZ shielded deep groove ball bearing with 40 mm bore. Metal shields on both sides protect against contaminants. Pressed steel cage and normal clearance. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034232/as-markdown/)
- [NSK 6308ZZC3 shielded deep groove ball bearing with 40 mm bore and C3 clearance. It features double metal shields (ZZ) for protection against contaminants and a pressed steel cage. Suitable for electric motors, pumps, fans, and general industrial applications.](https://www.mrosupply.com/products/5034233/as-markdown/)
- [Koyo 6308 ZZ is a 63 series single-row deep groove ball bearing with a 40 mm bore, 90 mm OD, and 23 mm width. It features double steel shields (ZZ) and a pressed steel cage. Designed for radial loads in electric motors, pumps, fans, and general industrial rotating equipment.](https://www.mrosupply.com/products/1494950/as-markdown/)
- [NACHI 6308ZZEC3 Deep Groove Ball Bearing Single Row 40X90X23MM Two Shields Steel Cage C3 Clearance](https://www.mrosupply.com/products/207857/as-markdown/)






## 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.