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NTN 7308BG is a single-row angular contact ball bearing with a 40 mm straight bore. Open type design with no seals or shields. Suitable for high-speed and combined radial-axial load applications in pumps, compressors, and machine tool spindles.
MODEL 7308BG
$145.49 Each
Prices are subject to change
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Returnable:No
a (Load Center)
1.5354 in
B (in)
0.9055
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
Configuration
One
Contact angle
40 º
D (in)
3.5433
d (in)
1.5748
Da max
3.2087 in
da min
1.9094 in
Db max
3.3268 in
db min
1.7913 in
Double Row Width
1.8110 in
Dynamic Load Rating
10100 lbf
Dynamic load rating
10100 lbf
Enclosure
Open
I.D.
40 mm
Limiting Speed - Grease
7400 RPM
Limiting speed - grease
7400 RPM
Limiting Speed - Oil
9900 RPM
Limiting speed - oil
9900 RPM
Material
High carbon chrome steel
O.D.
90 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
3.6220 in
r (in)
0.0591
r1
0.0394 in
r1as max
0.0394 in
ras max
0.0591 in
Static Load Rating
6850 lbf
Static load rating
6850 lbf
Triple Row Width
2.7165 in
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 9900 RPM |
Limiting Speed - Grease | 7400 RPM |
Precision | ISO Class 0 |
Configuration | One |
Static Load Rating | 6850 lbf30500 N30.50 kN |
Dynamic Load Rating | 10100 lbf45000 N45.00 kN |
Enclosure | Open |
Weight | 1.413 lb0.641 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
D | 3.5433 in90.000 mm |
B | 0.9055 in23.000 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0394 in1.000 mm |
Contact Angle | 40 |
a (Load Center) | 1.5354 in39.000 mm |
da min | 1.9094 in48.500 mm |
db min | 1.7913 in45.500 mm |
Da max | 3.2087 in81.500 mm |
Db max | 3.3268 in84.500 mm |
ras max | 0.0591 in1.500 mm |
r1as max | 0.0394 in1.000 mm |
Double Row Width | 1.8110 in46.000 mm |
Triple Row Width | 2.7165 in69.000 mm |
Quadruple Row Width | 3.6220 in92.000 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.
What is the difference between deep groove and angular contact ball bearings?
Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors. Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes. If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.
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