# Timken 3MM9128WI QUH Super Precision Angular Contact Ball Bearing, Quadruplex Heavy Preload, ABEC 7 (P4S) - MROSupply.com

***Timken 3MM9128WI QUH super precision angular contact ball bearing, quadruplex set with heavy preload (QUH), ABEC 7 (P4S) precision class. Designed for machine tool spindles and high-speed, high-rigidity applications requiring maximum axial and radial load capacity. Matched set ensures consistent preload and runout control for optimal spindle performance.***



## Product details:

- Catalog number: 3MM9128WI QUH
- SKU: 5084262
- Call for Pricing - 888-671-2883
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Timken](https://www.mrosupply.com/brands/timken/)
- 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: 30.459 lb
- Returns: Yes


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


## Product attributes;

  
- 1.2992 in C0 - Static Radial Rating (per row): 137400 N
  

  
- 28300 lbf Cage type: CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:154.3 mm
  

  
- 30900 lbf C1 ISO - Dynamic Radial Rating (per row): 126000 N
  

  
- 5.1968 in World part number: 7028E-T-P4S-QUH
  

  
- 6.080 in Limiting Speed (Grease) (per row): 5300 RPM Limiting speed (oil):10600 RPM Manufacturing part number:3MM9128WI QUH O.D. (in):210 mm 8.2677 Outer ring backing diameter:196.5 mm
  

  
- 7.740 in Precision rating: ISO P4S (ABEC 7/9) Rows per set:Quadruplex Total width:132 mm
  

  
- Ball type: Steel Bearing width:33 mm
  

  
- Ball Type: STEEL
  

  
- Bearing Width: 33 mm 1.2992 in
  

  
- Bore: 140 mm
  

  
- C0 - Static Radial Rating (per row): 137400 N 30900 lbf
  

  
- C1 ISO - Dynamic Radial Rating (per row): 126000 N 28300 lbf
  

  
- Cage Type: CR - Phenolic Outer Land Riding Cage
  

  
- Ce - Dynamic Radial Rating (per row): 138300 N 31100 lbf
  

  
- Contact Angle: 25 º
  

  
- d - Bore: 140 mm
  

  
- D - Outer Diameter: 210.000 mm 8.2677 in
  

  
- da - Inner Ring Backing Diameter: 154.3 mm 6.080 in
  

  
- Da - Outer Ring Backing Diameter: 196.5 mm 7.740 in
  

  
- Design Units: Metric
  

  
- DOuter Ring Backing Diameter: 196.5 mm 7.740 in
  

  
- Dynamic Radial Rating (per row): 138300 N 31100 lbf
  

  
- I.D.: 140 mm
  

  
- Inner Ring 'To Clear' Radius: 2 mm 0.079 in
  

  
- Inner Ring Backing Diameter: 154.3 mm 6.080 in
  

  
- Limiting Speed (Grease) (per row): 5300 rpm
  

  
- Limiting Speed (Oil): 10600 rpm
  

  
- Manufacturing Part Number: 3MM9128WI QUH
  

  
- Outer Diameter: 210.000 mm 8.2677 in
  

  
- Outer Ring 'To Clear' Radius: 2 mm 0.079 in
  

  
- Precision Rating: ISO P4S (ABEC 7/9)
  

  
- R - Inner Ring "To Clear" Radius: 2 mm 0.079 in
  

  
- r - Outer Ring "To Clear" Radius: 2 mm 0.079 in
  

  
- Rows per Set: Quadruplex
  

  
- Static Radial Rating (per row): 137400 N 30900 lbf
  

  
- Total Width: 132 mm 5.1968 in
  

  
- World Part Number: 7028E-T-P4S-QUH
  
## Product documents / software:

- [Catalog](https://documents.mrosupply.com/product_documents/50/60/5060627/Machine-Tool-Applications-Catalog_R9rBZA3.pdf)

## Product's reviews:
- Best company to buy from - I always buy from MRO is a very reliable company to work with




## 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.