# Timken QMCW18J303SB Spherical Roller Mounted Unit, Frame 18, Adapter Mount - MROSupply.com

***Timken QMCW18J303SB is a spherical roller mounted unit with a QMCW cartridge housing and adapter mount locking. This housed unit features a frame size 18 and is designed for imperial shaft applications. The self-aligning spherical roller bearing insert accommodates misalignment and is suitable for heavy-duty industrial environments such as conveyors and processing equipment.***



## Product details:

- Catalog number: QMCW18J303SB
- SKU: 5984355
- Price: ***$963.20*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Timken](https://www.mrosupply.com/brands/timken/)
- Category: 
    - [Piloted Flange](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/flanged-mounted-bearings/piloted-flange/)
    - [Flanged Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/flanged-mounted-bearings/)
    - [Mounted Roller Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/)
    - [Mounted Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Returns: Yes


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


## Product attributes;

  
- 0.060 mm Shaft Size: 3 3/16 in Shaft Tolerance:0.0030 in
  

  
- 0.076 mm Shaft size type: Imperial Y1 - Geometry Factor:2.90 Y2 - Geometry Factor:4.31 e - Geometry Factor:0.23
  

  
- 0.100 mm Pre Install Clearance Min: 0.0024 in
  

  
- 110.2 mm Dimension R: 0.31 in
  

  
- 112.3 mm Dimension L Fix: 4.34 in
  

  
- 120.9 mm Dimension B Exp: 2.54 in
  

  
- 20 mm Dimension L Exp: 4.42 in
  

  
- 219.2 mm Dimension J (Bolt Size): 0.75 in
  

  
- 62.5 mm Dimension BC: 8.63 in
  

  
- 64.5 mm Dimension B Fix: 2.46 in
  

  
- 7.9 mm Eng Internal Radial Clearance - Max: 0.0039 Eng Internal Radial Clearance - Min:0.0024 Engineering group:Mounted Bearing Float:0.083 in
  

  
- Bearing number: 22218 C - Dynamic Load (Basic):79700 lbf 355000 N C0 - Static Load:87200 lbf 388000 N Dimension:4.76 in
  

  
- Bearing Number: 22218
  

  
- C - Dynamic Load (Basic): 79700 lbf 355000 N
  

  
- C0 - Static Load: 87200 lbf 388000 N
  

  
- Dimension B Exp: 2.54 in 64.5 mm
  

  
- Dimension B Fix: 2.46 in 62.5 mm
  

  
- Dimension BC: 8.63 in 219.2 mm
  

  
- Dimension C: 4.76 in 120.9 mm
  

  
- Dimension D: 7.38 in 187.5 mm
  

  
- Dimension E: 6.1 in 154.9 mm
  

  
- Dimension F: 10.25 in 260.4 mm
  

  
- Dimension G: 7.375 in 187.3 mm
  

  
- Dimension H: 0.88 in 22.4 mm
  

  
- Dimension J (Bolt Size): 0.75 in 20 mm
  

  
- Dimension K: 1.44 in 36.6 mm
  

  
- Dimension L Exp: 4.42 in 112.3 mm
  

  
- Dimension L Fix: 4.34 in 110.2 mm
  

  
- Dimension M: 2.59 in 65.8 mm
  

  
- Dimension N: 1.88 in 47.8 mm
  

  
- Dimension R: 0.31 in 7.9 mm
  

  
- Dimension S: 4.03 in 102.4 mm
  

  
- Dynamic Load (Basic): 79700 lbf
  

  
- e - Geometry Factor: 0.23
  

  
- Eng Internal Radial Clearance - Max: 0.0039
  

  
- Eng Internal Radial Clearance - Min: 0.0024
  

  
- Eng Internal Radial ClearancMax: 0.0039
  

  
- Eng Internal Radial ClearancMin: 0.0024
  

  
- Engineering Group: Mounted Bearing
  

  
- Float: 0.083 in 2.108 mm
  

  
- Full Timken Part Number: QMCW18J303SB QMCW18J303SC QMCW18J303SEB QMCW18J303SEC QMCW18J303SEM QMCW18J303SEN QMCW18J303SEO QMCW18J303SET QMCW18J303SM QMCW18J303SN QMCW18J303SO QMCW18J303ST
  

  
- Geometry Factor: 4.31
  

  
- Grease Lubrication - B/C/O Seal: 1000 rpm
  

  
- Grease Lubrication - M/N Seal: 1400 rpm
  

  
- Grease Lubrication - T Seal: 2000 rpm
  

  
- Housing Construction: Piloted Flange Cartridge
  

  
- Locking Style: Eccentric
  

  
- Oil Lubrication - B/C/O Seal: 1000 rpm
  

  
- Oil Lubrication - M/N Seal: 1400 rpm
  

  
- Oil Lubrication - T Seal: 2400 rpm
  

  
- Pre Install Clearance Max: 0.0039 in 0.100 mm
  

  
- Pre Install Clearance Min: 0.0024 in 0.060 mm
  

  
- Shaft Size: 3 3/16 in
  

  
- Shaft Size Type: Imperial
  

  
- Shaft Tolerance: 0.0030 in 0.076 mm
  

  
- Static Load: 87200 lbf
  

  
- Y1 - Geometry Factor: 2.90
  

  
- Y2 - Geometry Factor: 4.31
  
## Product documents / software:

- [Eccentric Piloted Flange Cartridge](https://documents.mrosupply.com/product_documents/59/82/5982822/qmcw18j303s_3ZwEO8r)

## 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.