# Timken QAATP18A303SEM Spherical Roller Take-Up Bearing Unit, Frame 18, V-Lock Locking - MROSupply.com

***Timken QAATP18A303SEM is a spherical roller take-up bearing unit. This housed unit features a heavy-duty spherical roller bearing insert within a take-up frame, designed for adjustable conveyor and power transmission applications. It utilizes a single V-Lock (SM) concentric collar for secure shaft attachment.***



## Product details:

- Catalog number: QAATP18A303SEM
- SKU: 5984734
- Price: ***$1,048.62*** Each
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Timken](https://www.mrosupply.com/brands/timken/)
- Category: 
    - [Take-Up Bearing Units](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/take-up-bearings/take-up-bearing-units/)
    - [Take-Up Bearings](htts://www.mrosupply.com/bearings/mounted-bearings/mounted-roller-bearings/take-up-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
  

  
- 103.9 mm Dimension A1: 4.32 in
  

  
- 109.7 mm Dimension Q: 1.31 in
  

  
- 131.8 mm Dimension U: 0.81 in
  

  
- 20.6 mm Eng Internal Radial Clearance - Max: 0.0039 Eng Internal Radial Clearance - Min:0.0024 Engineering group:Mounted Bearing Float:0.08 in
  

  
- 20.8 mm Dimension TAA: 5.19 in
  

  
- 33.3 mm Dimension RAA: 0.82 in
  

  
- Bearing number: 22218 C - Dynamic Load (Basic):79700 lbf 355000 N C0 - Static Load:87200 lbf 388000 N Dimension:4.09 in
  

  
- Bearing Number: 22218
  

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

  
- C0 - Static Load: 87200 lbf 388000 N
  

  
- Dimension A1: 4.32 in 109.7 mm
  

  
- Dimension B: 4.09 in 103.9 mm
  

  
- Dimension C: 5.13 in 130.2 mm
  

  
- Dimension D: 9.94 in 252.5 mm
  

  
- Dimension E: 8.41 in 213.6 mm
  

  
- Dimension F: 2.41 in 61.3 mm
  

  
- Dimension G: 3.54 in 90 mm
  

  
- Dimension H: 4.5 in 114.3 mm
  

  
- Dimension J: 2.25 in 57.1 mm
  

  
- Dimension L: 9.5 in 241.3 mm
  

  
- Dimension M: 2.59 in 65.9 mm
  

  
- Dimension N: 4.37 in 110.9 mm
  

  
- Dimension P: 9 in 228.6 mm
  

  
- Dimension Q: 1.31 in 33.3 mm
  

  
- Dimension RAA: 0.82 in 20.8 mm
  

  
- Dimension S: 1.38 in 35.1 mm
  

  
- Dimension TAA: 5.19 in 131.8 mm
  

  
- Dimension U: 0.81 in 20.6 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: 0.08 in 2.03 mm
  

  
- Full Timken Part Number: QAATP18A303SB QAATP18A303SC QAATP18A303SEB QAATP18A303SEC QAATP18A303SEM QAATP18A303SEN QAATP18A303SEO QAATP18A303SET QAATP18A303SM QAATP18A303SN QAATP18A303SO QAATP18A303ST
  

  
- 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: Top Pull Take-Up
  

  
- Locking Style: Double Concentric
  

  
- 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:

- [Double Concentric Top Pull Take Up Block](https://documents.mrosupply.com/product_documents/59/82/5982308/qaatp18a303s_EGtkO1C)

## 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.