# Timken 2MM9121WI DUH Super Precision Angular Contact Ball Bearing, Duplex Heavy Preload, P4S/ABEC 7 - MROSupply.com

***Timken 2MM9121WI DUH is a super precision angular contact ball bearing configured as a duplex set with heavy preload (DUH). This P4S-class bearing meets ABEC 7/9 precision standards for machine tool spindles, grinders, and high-speed applications requiring extreme rigidity and minimal runout. The duplex back-to-back arrangement provides high moment load capacity and precise axial location.***



## Product details:

- Catalog number: 2MM9121WI DUH
- SKU: 5081140
- 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: 7.130 lb
- Returns: Yes


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


## Product attributes;

  
- 1.0236 in C0 - Static Radial Rating (per row): 89400 N
  

  
- 19900 lbf Cage type: CR - Phenolic Outer Land Riding Cage Contact angle:15 Design units:Metric Inner ring backing diameter:115.7 mm
  

  
- 2.0472 in World part number: 7021C-T-P4S-DUH
  

  
- 20100 lbf C1 ISO - Dynamic Radial Rating (per row): 88700 N
  

  
- 4.560 in Limiting Speed (Grease) (per row): 7900 rpm Limiting speed (oil):15800 RPM Manufacturing part number:2MM9121WI DUH O.D. (in):160 mm 6.2992 Outer ring backing diameter:150 mm
  

  
- 5.910 in Precision rating: ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:52 mm
  

  
- Ball type: Steel Bearing width:26 mm
  

  
- Ball Type: STEEL
  

  
- Bearing Width: 26 mm 1.0236 in
  

  
- Bore: 105 mm
  

  
- C0 - Static Radial Rating (per row): 89400 N 20100 lbf
  

  
- C1 ISO - Dynamic Radial Rating (per row): 88700 N 19900 lbf
  

  
- Cage Type: CR - Phenolic Outer Land Riding Cage
  

  
- Ce - Dynamic Radial Rating (per row): 97900 N 22000 lbf
  

  
- Contact Angle: 15 º
  

  
- d - Bore: 105 mm
  

  
- D - Outer Diameter: 160 mm 6.2992 in
  

  
- da - Inner Ring Backing Diameter: 115.7 mm 4.560 in
  

  
- Da - Outer Ring Backing Diameter: 150 mm 5.910 in
  

  
- Design Units: Metric
  

  
- DOuter Ring Backing Diameter: 150 mm 5.910 in
  

  
- Dynamic Radial Rating (per row): 97900 N 22000 lbf
  

  
- I.D.: 105 mm
  

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

  
- Inner Ring Backing Diameter: 115.7 mm 4.560 in
  

  
- Limiting Speed (Grease) (per row): 7900 rpm
  

  
- Limiting Speed (Oil): 15800 rpm
  

  
- Manufacturing Part Number: 2MM9121WI DUH
  

  
- Outer Diameter: 160 mm 6.2992 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: Duplex
  

  
- Static Radial Rating (per row): 89400 N 20100 lbf
  

  
- Total Width: 52 mm 2.0472 in
  

  
- World Part Number: 7021C-T-P4S-DUH
  
## 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.