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NTN 7209BG single-row angular contact ball bearing with 45 mm straight bore. Open design without seals or shields. 72 series light cross-section for combined radial and axial loads at moderate speeds. Suitable for pumps, electric motors, and machine tool spindles.
MODEL 7209BG
$111.29 Each
Prices are subject to change
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Returnable:No
a (Load Center)
1.4567 in
B (in)
0.7480
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)
3.3465
d (in)
1.7717
Da max
3.0709 in
da min
2.0472 in
Db max
3.1693 in
db min
1.9488 in
Double Row Width
1.4961 in
Dynamic Load Rating
8100 lbf
Dynamic load rating
8100 lbf
Enclosure
Open
I.D.
45 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.
85 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
2.9921 in
r (in)
0.0433
r1
0.0236 in
r1as max
0.0236 in
ras max
0.0394 in
Static Load Rating
5900 lbf
Static load rating
5900 lbf
Triple Row Width
2.2441 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 | 5900 lbf26200 N26.20 kN |
Dynamic Load Rating | 8100 lbf36000 N36.00 kN |
Enclosure | Open |
Weight | 0.897 lb0.407 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.7717 in45.000 mm |
D | 3.3465 in85.000 mm |
B | 0.7480 in19.000 mm |
r | 0.0433 in1.100 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 40 |
a (Load Center) | 1.4567 in37.000 mm |
da min | 2.0472 in52.000 mm |
db min | 1.9488 in49.500 mm |
Da max | 3.0709 in78.000 mm |
Db max | 3.1693 in80.500 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 mm |
Double Row Width | 1.4961 in38.000 mm |
Triple Row Width | 2.2441 in57.000 mm |
Quadruple Row Width | 2.9921 in76.000 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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