# Timken 3780-902A8 Double-Cup Tapered Roller Bearing Assembly, <4 in OD, Precision Matched - MROSupply.com

***Timken 3780-902A8 double-cup tapered roller bearing assembly with precision cup-match code 902A8 for consistent preload and runout. Under 4-inch outside diameter size class. Double outer race configuration for heavy-duty industrial gearboxes, machine tool spindles, and equipment requiring high radial and axial load capacity.***



## Product details:

- Catalog number: 3780-902A8
- SKU: 5063684
- 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: 
    - [Taper Roller Bearing Full Assemblies](htts://www.mrosupply.com/bearings/roller-bearings/taper-roller-bearings/taper-roller-bearing-full-assemblies/)
    - [Taper Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/taper-roller-bearings/)
    - [Roller Bearings](htts://www.mrosupply.com/bearings/roller-bearings/)
    - [Bearings](htts://www.mrosupply.com/bearings/)
- Unit of measure: each
- Weight: 3.991 lb
- Returns: Yes


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


## Product attributes;

  
- 1.5 mm Cone backface backing diameter: 2.52 in
  

  
- 30.302 mm Cup frontface backing diameter: 3.50 in
  

  
- 52.388 mm Cage material: Stamped Steel Cage-cone backface clearance:0.06 in
  

  
- 64 mm Cone part number: 3780 Cone width:1.1930 in
  

  
- 88.90 mm Cup outer diameter: 3.6718 in
  

  
- 93.264 mm Cup part number: 3729D Design unit:Inch Related Assembly Number(s):3780-90061 3780-90064 3780-90137 3780-90162 3780-902A4 3780-902A6 3780-902A8 Series:3700 T - Bearing Width across Cones:2.5625 in
  

  
- C - Double Cup Width: 2.0625 in
  

  
- I.D.: 2 in / 50.8 mm
  
## Product documents / software:

- [Product Information](https://documents.mrosupply.com/product_documents/35/81/358135/apered-Single-Roller-Bearings---TS-Engineering_946wybP.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.