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NTN 749/742 inch series tapered roller bearing assembly with straight bore and open design. Constructed from case carburized steel for durability in moderate-load industrial applications such as gearboxes and conveyor systems.
MODEL 749/742
$157.53 Each
Prices are subject to change
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Returnable:No
a (Effective Load Center)
-0.4700 in
B (in)
3.3475
Bore Type
Round
Bore type
Round
Cone Number
749
Configuration
One
Cup Number
742
D (in)
5.9090
Dynamic Load Rating
64500 lbf
Dynamic load rating
64500 lbf
e (Axial Load Factor)
0.33
Enclosure
Open
I.D.
3.3475 in
Lubrication
w/o Oil Hole
Material
Case carburized steel
O.D.
5.909 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
93500 lbf
Static load rating
93500 lbf
Style
Cone & cup
Type
Tapered Roller Bearing
U
3.98 in
V
3.74 in
W
1.7500 in
Wi
1.8375 in
Wo
1.4375 in
X
5.59 in
Y2 (Axial Load Factor)
1.84
Z
5.28 in
Technical Specifications
Type |
Tapered Roller Bearing |
Bore Type |
Round |
Material |
Case Carburized Steel |
Style |
Cone & Cup |
Precision Rating |
Class 2 |
Cone Number |
749 |
Cup Number |
742 |
Configuration |
One |
Lubrication |
w/o Oil Hole |
e (Axial Load Factor) |
0.33 |
Y2 (Axial Load Factor) |
1.84 |
Static Load Rating |
93500 lbf415000 N415.00 kN |
Dynamic Load Rating |
64500 lbf287000 N287.00 kN |
Enclosure |
Open |
Operating Temperature Range |
-40 to 250 F-40 to 120 C |
Dimensional Specifications
|
|
|
B |
3.3475 in85.026 mm |
D |
5.9090 in150.089 mm |
Wo |
1.4375 in36.513 mm |
Wi |
1.8375 in46.672 mm |
W |
1.7500 in44.450 mm |
r |
0.1300 in3.300 mm |
R |
0.14 in3.5 mm |
a (Effective Load Center) |
-0.4700 in-11.900 mm |
U |
3.98 in101.0 mm |
V |
3.74 in95.0 mm |
X |
5.59 in142.0 mm |
Z |
5.28 in134.0 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.
