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The NTN 623/612 is an inch series single row tapered roller bearing with a straight bore. This bearing consists of a cone (623) and cup (612) assembly designed for combined radial and axial loads. It is commonly used in gearboxes, axle housings, and industrial machinery where high load capacity and durability are required.
MODEL 623/612
$199.14 Each
Prices are subject to change
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Returnable:No
a (Effective Load Center)
-0.5500 in
B (in)
2.2500
Bore Type
Round
Bore type
Round
Cone Number
623
Configuration
One
Cup Number
612
D (in)
4.7500
Dynamic Load Rating
42500 lbf
Dynamic load rating
42500 lbf
e (Axial Load Factor)
0.31
Enclosure
Open
I.D.
57.15 mm
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
10 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)
0.14
r (in)
0.1300
Static Load Rating
54500 lbf
Static load rating
54500 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
2.83 in
V
2.60 in
W
1.6250 in
Wi
1.6250 in
Width
41.275 mm
Wo
1.2500 in
X
4.33 in
Y2 (Axial Load Factor)
1.91
Z
4.13 in
Technical Specifications
Type | Tapered Roller Bearing |
Bore Type | Round |
Material | Case Carburized Steel |
Style | Cone & Cup |
Precision Rating | Class 4 |
Cone Number | 623 |
Cup Number | 612 |
Configuration | One |
Lubrication | w/o Oil Hole |
e (Axial Load Factor) | 0.31 |
Y2 (Axial Load Factor) | 1.91 |
Static Load Rating | 54500 lbf243000 N243.00 kN |
Dynamic Load Rating | 42500 lbf189000 N189.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
B | 2.2500 in57.150 mm |
D | 4.7500 in120.650 mm |
Wo | 1.2500 in31.750 mm |
Wi | 1.6250 in41.275 mm |
W | 1.6250 in41.275 mm |
r | 0.1300 in3.300 mm |
R | 0.14 in3.5 mm |
a (Effective Load Center) | -0.5500 in-14.000 mm |
U | 2.83 in72.0 mm |
V | 2.60 in66.0 mm |
X | 4.33 in110.0 mm |
Z | 4.13 in105.0 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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