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NTN 2878/2820 is an inch series tapered roller bearing set consisting of cone 2878 and cup 2820. It features a straight bore, open enclosure, and case carburized steel construction for durability under heavy radial and axial loads. This single row set is suitable for industrial gearboxes, axle housings, and vehicle wheel hubs.
MODEL 2878/2820
$97.31 Each
Prices are subject to change
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Returnable:No
a (Effective Load Center)
-0.2200 in
B (in)
1.3750
Bore Type
Round
Bore type
Round
Cone Number
2878
Configuration
One
Cup Number
2820
D (in)
2.8750
Dynamic Load Rating
14100 lbf
Dynamic load rating
14100 lbf
e (Axial Load Factor)
0.37
Enclosure
Open
I.D.
1.375 in
Limiting Speed - Grease
5200 RPM
Limiting speed - grease
5200 RPM
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
2.875 in
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision Rating
Class 4
Precision rating
Class 4
r (in)
0.1300
R (in)
0.03
r1as max
0.1299 in
ras max
0.0315 in
Static Load Rating
17000 lbf
Static load rating
17000 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
1.65 in
V
1.61 in
W
0.8750 in
Wi
0.9375 in
Wo
0.6875 in
X
2.68 in
Y2 (Axial Load Factor)
1.63
Z
2.48 in
Technical Specifications
Type | Tapered Roller Bearing |
Bore Type | Round |
Material | Case Carburized Steel |
Limiting Speed - Grease | 5200 RPM |
Style | Cone & Cup |
Precision Rating | Class 4 |
Cone Number | 2878 |
Cup Number | 2820 |
Configuration | One |
Lubrication | w/o Oil Hole |
e (Axial Load Factor) | 0.37 |
Y2 (Axial Load Factor) | 1.63 |
Static Load Rating | 17000 lbf75500 N75.50 kN |
Dynamic Load Rating | 14100 lbf62500 N62.50 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
B | 1.3750 in34.925 mm |
D | 2.8750 in73.025 mm |
Wo | 0.6875 in17.463 mm |
Wi | 0.9375 in23.812 mm |
W | 0.8750 in22.225 mm |
r | 0.1300 in3.300 mm |
R | 0.03 in0.8 mm |
a (Effective Load Center) | -0.2200 in-5.500 mm |
U | 1.65 in42.0 mm |
V | 1.61 in41.0 mm |
X | 2.68 in68.0 mm |
Z | 2.48 in63.0 mm |
ras max | 0.0315 in |
r1as max | 0.1299 in3.000 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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