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NTN 3778 is an inch-series single row tapered roller bearing with a straight bore. Designed for radial and axial load combinations, it is commonly used in gearboxes, wheel hubs, and industrial machinery. The bearing features a stamped steel cage and is supplied as a full assembly.
MODEL 3778
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$56.11 Each
Prices are subject to change
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Brand Minimum Order Quantity: 2
Typically Ships in: 1 day
Returnable:No
Height
3.672
I.D.
1.875 in
Length
3.672
O.D.
3.6718 in
Width
1.193
Technical Specifications
Type | Cone |
Bore Type | Round |
Material | Case Carburized Steel |
Static Load Rating | 33500 lbf148000 N148.00 kN |
Dynamic Load Rating | 24500 lbf109000 N109.00 kN |
| 1.321 lb0.599 kg | |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Y2 (Axial Load Factor) | 1.77 |
e (Axial Load Factor) | 0.34 |
Dimensional Specifications
| |
B | 1.8750 in47.625 mm |
Wi | 1.1930 in30.302 mm |
R | 0.2500 in6.400 mm |
U | 2.64 in67.0 mm |
V | 2.17 in55.0 mm |
a (Effective Load Center) | -0.3200 in-8.100 mm |
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.
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