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NTN 387A/382A inch series single row tapered roller bearing with straight bore and open enclosure. Constructed from case carburized steel for high radial and axial load capacity in a compact footprint. Suitable for gearboxes, wheel hubs, and industrial shaft applications.
MODEL 387A/382A
$30.82 Each
Prices are subject to change
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a (Effective Load Center)
-0.1200 in
B (in)
2.2500
Bore Type
Round
Bore type
Round
Cone Number
387A
Configuration
One
Cup Number
382A
D (in)
3.8125
Dynamic Load Rating
18500 lbf
Dynamic load rating
18500 lbf
e (Axial Load Factor)
0.35
Enclosure
Open
I.D.
2.25 in
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
3.8125 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)
0.14
r (in)
0.0300
Static Load Rating
23600 lbf
Static load rating
23600 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
2.72 in
V
2.44 in
W
0.8268 in
Wi
0.8640 in
Width
0.864
Wo
0.6250 in
X
3.62 in
Y0 (Axial Load Factor)
0.93
Y2 (Axial Load Factor)
1.69
Z
3.54 in
Technical Specifications
Type | Tapered Roller Bearing |
Bore Type | Round |
Material | Case Carburized Steel |
Style | Cone & Cup |
Precision Rating | Class 2 |
Cone Number | 387A |
Cup Number | 382A |
Configuration | One |
Lubrication | w/o Oil Hole |
e (Axial Load Factor) | 0.35 |
Y2 (Axial Load Factor) | 1.69 |
Y0 (Axial Load Factor) | 0.93 |
Static Load Rating | 23600 lbf105000 N105.00 kN |
Dynamic Load Rating | 18500 lbf82500 N82.50 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
B | 2.2500 in57.150 mm |
D | 3.8125 in96.838 mm |
Wo | 0.6250 in15.875 mm |
Wi | 0.8640 in21.946 mm |
W | 0.8268 in21.000 mm |
r | 0.0300 in0.800 mm |
R | 0.14 in3.5 mm |
a (Effective Load Center) | -0.1200 in-3.000 mm |
U | 2.72 in69.0 mm |
V | 2.44 in62.0 mm |
X | 3.62 in92.0 mm |
Z | 3.54 in90.0 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.
#1495542
Brand
Koyo Bearing
Model
387/382A
#1494389
Brand
Koyo Bearing
Model
387
#1494386
Brand
Koyo Bearing
Model
382A
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