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The NTN 390/394A is an inch series single row tapered roller bearing with a straight bore. Designed for moderate radial and axial loads in industrial gearboxes, vehicle hubs, and conveyor systems.
MODEL 390/394A
$51.37 Each
Prices are subject to change
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Returnable:No
a (Effective Load Center)
-0.0300 in
B (in)
2.2500
Bore Type
Round
Bore type
Round
Cone Number
390
Configuration
One
Cup Number
394A
D (in)
4.3307
Dynamic Load Rating
20200 lbf
Dynamic load rating
20200 lbf
e (Axial Load Factor)
0.40
Enclosure
Open
I.D.
2.25 in
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
4.3307 in
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision Rating
Class 2
Precision rating
Class 2
R (in)
0.09
r (in)
0.0500
Static Load Rating
27700 lbf
Static load rating
27700 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
2.76 in
V
2.60 in
W
0.8661 in
Wi
0.8660 in
Wo
0.7411 in
X
4.09 in
Y2 (Axial Load Factor)
1.49
Z
3.98 in
Technical Specifications
Type | Tapered Roller Bearing |
Bore Type | Round |
Material | Case Carburized Steel |
Style | Cone & Cup |
Precision Rating | Class 2 |
Cone Number | 390 |
Cup Number | 394A |
Configuration | One |
Lubrication | w/o Oil Hole |
e (Axial Load Factor) | 0.40 |
Y2 (Axial Load Factor) | 1.49 |
Static Load Rating | 27700 lbf123000 N123.00 kN |
Dynamic Load Rating | 20200 lbf90000 N90.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
B | 2.2500 in57.150 mm |
D | 4.3307 in110.000 mm |
Wo | 0.7411 in18.824 mm |
Wi | 0.8660 in21.996 mm |
W | 0.8661 in22.000 mm |
r | 0.0500 in1.300 mm |
R | 0.09 in2.3 mm |
a (Effective Load Center) | -0.0300 in-0.800 mm |
U | 2.76 in70.0 mm |
V | 2.60 in66.0 mm |
X | 4.09 in104.0 mm |
Z | 3.98 in101.0 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.
