# Timken 3MM9118WI DUH Super Precision Angular Contact Ball Bearing, Duplex Heavy Preload, ABEC 7 P4S - MROSupply.com

***Timken 3MM9118WI DUH super precision angular contact ball bearing configured as a duplex set with heavy preload (DUH). Meets ABEC 7 (P4S) precision standards for high rigidity and minimal runout. Suitable for demanding machine tool spindles, precision grinders, and high-speed applications where axial load capacity and accuracy are critical.***



## Product details:

- Catalog number: 3MM9118WI DUH
- SKU: 5071217
- 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: 5.159 lb
- Returns: Yes


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


## Product attributes;

  
- 0.9449 in C0 - Static Radial Rating (per row): 65800 N
  

  
- 1.8898 in World part number: 7018E-T-P4S-DUH
  

  
- 14800 lbf C1 ISO - Dynamic Radial Rating (per row): 68500 N
  

  
- 15400 lbf Cage type: CR - Phenolic Outer Land Riding Cage Contact angle:25 Design units:Metric Inner ring backing diameter:99.7 mm
  

  
- 3.930 in Limiting Speed (Grease) (per row): 8300 rpm Limiting speed (oil):16600 RPM Manufacturing part number:3MM9118WI DUH O.D. (in):140 mm 5.5118 Outer ring backing diameter:130.9 mm
  

  
- 5.160 in Precision rating: ISO P4S (ABEC 7/9) Rows per set:Duplex Total width:48 mm
  

  
- Ball type: Steel Bearing width:24 mm
  

  
- Ball Type: STEEL
  

  
- Bearing Width: 24 mm 0.9449 in
  

  
- Bore: 90 mm
  

  
- C0 - Static Radial Rating (per row): 65800 N 14800 lbf
  

  
- C1 ISO - Dynamic Radial Rating (per row): 68500 N 15400 lbf
  

  
- Cage Type: CR - Phenolic Outer Land Riding Cage
  

  
- Ce - Dynamic Radial Rating (per row): 75200 N 16900 lbf
  

  
- Contact Angle: 25 º
  

  
- d - Bore: 90 mm
  

  
- D - Outer Diameter: 140 mm 5.5118 in
  

  
- da - Inner Ring Backing Diameter: 99.7 mm 3.930 in
  

  
- Da - Outer Ring Backing Diameter: 130.9 mm 5.160 in
  

  
- Design Units: Metric
  

  
- DOuter Ring Backing Diameter: 130.9 mm 5.160 in
  

  
- Dynamic Radial Rating (per row): 75200 N 16900 lbf
  

  
- I.D.: 90 mm
  

  
- Inner Ring 'To Clear' Radius: 1.5 mm 0.059 in
  

  
- Inner Ring Backing Diameter: 99.7 mm 3.930 in
  

  
- Limiting Speed (Grease) (per row): 8300 rpm
  

  
- Limiting Speed (Oil): 16600 rpm
  

  
- Manufacturing Part Number: 3MM9118WI DUH
  

  
- Outer Diameter: 140 mm 5.5118 in
  

  
- Outer Ring 'To Clear' Radius: 1.5 mm 0.059 in
  

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

  
- R - Inner Ring "To Clear" Radius: 1.5 mm 0.059 in
  

  
- r - Outer Ring "To Clear" Radius: 1.5 mm 0.059 in
  

  
- Rows per Set: Duplex
  

  
- Static Radial Rating (per row): 65800 N 14800 lbf
  

  
- Total Width: 48 mm 1.8898 in
  

  
- World Part Number: 7018E-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.