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NTN 3984/3920 inch series tapered roller bearing set consisting of cone 3984 and cup 3920. Straight bore, open enclosure, case carburized steel construction. Single row design for high radial and axial load capacity in industrial applications.
MODEL 3984/3920
$80.45 Each
Prices are subject to change
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Returnable:No
a (Effective Load Center)
-0.1800 in
B (in)
2.6250
Bore Type
Round
Bore type
Round
Cone Number
3984
Configuration
One
Cup Number
3920
D (in)
4.4375
Dynamic Load Rating
28100 lbf
Dynamic load rating
28100 lbf
e (Axial Load Factor)
0.40
Enclosure
Open
I.D.
2.625 in
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
4.4375 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)
0.1300
Static Load Rating
42000 lbf
Static load rating
42000 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
3.15 in
V
2.91 in
W
1.1875 in
Wi
1.1830 in
Wo
0.9375 in
X
4.17 in
Y2 (Axial Load Factor)
1.49
Z
3.90 in
Technical Specifications
Type | Tapered Roller Bearing |
Bore Type | Round |
Material | Case Carburized Steel |
Style | Cone & Cup |
Precision Rating | Class 2 |
Cone Number | 3984 |
Cup Number | 3920 |
Configuration | One |
Lubrication | w/o Oil Hole |
e (Axial Load Factor) | 0.40 |
Y2 (Axial Load Factor) | 1.49 |
Static Load Rating | 42000 lbf187000 N187.00 kN |
Dynamic Load Rating | 28100 lbf125000 N125.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
B | 2.6250 in66.675 mm |
D | 4.4375 in112.712 mm |
Wo | 0.9375 in23.812 mm |
Wi | 1.1830 in30.048 mm |
W | 1.1875 in30.163 mm |
r | 0.1300 in3.300 mm |
R | 0.14 in3.5 mm |
a (Effective Load Center) | -0.1800 in-4.600 mm |
U | 3.15 in80.0 mm |
V | 2.91 in74.0 mm |
X | 4.17 in106.0 mm |
Z | 3.90 in99.0 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.
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