# Timken 3MMC9112WI DUM Super Precision Angular Contact Ball Bearing, Duplex Medium Preload, ABEC 7/9 - MROSupply.com

***Timken 3MMC9112WI DUM super precision angular contact ball bearing, duplex set with medium preload. P4S-grade ABEC 7/9 precision for high-speed, high-rigidity machine tool spindles, precision grinders, and jig borers. Duplex back-to-back arrangement provides rigid axial location and accommodates combined radial and thrust loads.***



## Product details:

- Catalog number: 3MMC9112WI DUM
- SKU: 5084318
- 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: 1.803 lb
- Returns: Yes


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


## Product attributes;

  
- 0.7087 in C0 - Static Radial Rating (per row): 25900 N
  

  
- 1.4174 in World part number: C7012E-T-P4S-DUM
  

  
- 2.650 in Limiting Speed (Grease) (per row): 14640 rpm Limiting speed (oil):29280 rpm Manufacturing part number:3MMC9112WI DUM O.D. (in):95 mm 3.7402 Outer ring backing diameter:88.1 mm
  

  
- 3.470 in Precision rating: ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:36 mm
  

  
- 5830 lbf C1 ISO - Dynamic Radial Rating (per row): 33500 N
  

  
- 7540 lbf Cage type: CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:67.3 mm
  

  
- Ball type: Ceramic Bearing width:18 mm
  

  
- Ball Type: Ceramic
  

  
- Bearing Width: 18 mm 0.7087 in
  

  
- Bore: 60 mm
  

  
- C0 - Static Radial Rating (per row): 25900 N 5830 lbf
  

  
- C1 ISO - Dynamic Radial Rating (per row): 33500 N 7540 lbf
  

  
- Cage Type: CR - Phenolic Outer Land Riding Cage
  

  
- Ce - Dynamic Radial Rating (per row): 36900 N 8290 lbf
  

  
- Contact Angle: 25 º
  

  
- d - Bore: 60 mm
  

  
- D - Outer Diameter: 95.000 mm 3.7402 in
  

  
- da - Inner Ring Backing Diameter: 67.3 mm 2.650 in
  

  
- Da - Outer Ring Backing Diameter: 88.1 mm 3.470 in
  

  
- Design Units: Metric
  

  
- DOuter Ring Backing Diameter: 88.1 mm 3.470 in
  

  
- Dynamic Radial Rating (per row): 36900 N 8290 lbf
  

  
- I.D.: 60 mm
  

  
- Inner Ring 'To Clear' Radius: 1 mm 0.039 in
  

  
- Inner Ring Backing Diameter: 67.3 mm 2.650 in
  

  
- Limiting Speed (Grease) (per row): 14640 rpm
  

  
- Limiting Speed (Oil): 29280 rpm
  

  
- Manufacturing Part Number: 3MMC9112WI DUM
  

  
- Outer Diameter: 95.000 mm 3.7402 in
  

  
- Outer Ring 'To Clear' Radius: 1 mm 0.039 in
  

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

  
- R - Inner Ring "To Clear" Radius: 1 mm 0.039 in
  

  
- r - Outer Ring "To Clear" Radius: 1 mm 0.039 in
  

  
- Rows per Set: Duplex
  

  
- Static Radial Rating (per row): 25900 N 5830 lbf
  

  
- Total Width: 36 mm 1.4174 in
  

  
- World Part Number: C7012E-T-P4S-DUM
  
## 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.