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NTN 7309DB duplex angular contact ball bearing with a 45 mm straight bore. Back-to-back (DB) arrangement provides high axial rigidity and moment load capacity. Open design with steel cage. Constructed from high carbon chrome steel for durability in precision spindles, pumps, and gearboxes.
MODEL 7309DB
$267.85 Each
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2B
1.9685 in
B (in)
0.9843
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
Two
Contact angle
30 º
d (in)
1.7717
D (in)
3.9370
da min
2.1063 in
Db max
3.7205 in
Dynamic Load Rating
23200 lbf
Dynamic load rating
23200 lbf
Enclosure
Open
I.D.
45 mm
Limiting Speed - Grease
6200 RPM
Limiting speed - grease
6200 RPM
Limiting Speed - Oil
8200 RPM
Limiting speed - oil
8200 RPM
Material
High carbon chrome steel
O.D.
100 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0591
r1
0.0394 in
r1as max
0.0394 in
ras max
0.0591 in
Static Load Rating
19800 lbf
Static load rating
19800 lbf
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 | 8200 RPM |
Limiting Speed - Grease | 6200 RPM |
Precision | ISO Class 0 |
Configuration | Two |
Static Load Rating | 19800 lbf88000 N88.00 kN |
Dynamic Load Rating | 23200 lbf103000 N103.00 kN |
Enclosure | Open |
Weight | 3.655 lb1.658 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.7717 in45.000 mm |
D | 3.9370 in100.000 mm |
B | 0.9843 in25.000 mm |
2B | 1.9685 in50.000 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0394 in1.000 mm |
Contact Angle | 30 |
da min | 2.1063 in53.500 mm |
Db max | 3.7205 in94.500 mm |
ras max | 0.0591 in1.500 mm |
r1as max | 0.0394 in1.000 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.
#1132555
Brand
MRC Bearing
Model
309RDT1-1/2
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