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NTN 7306BG is a 73 series single-row angular contact ball bearing with a 30 mm straight bore. Open type design with no seals or shields. Suitable for high-speed and radial-axial load applications in pumps, compressors, and machine tool spindles.
MODEL 7306BG
$114.58 Each
Prices are subject to change
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Returnable:No
a (Load Center)
1.2402 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)
2.8346
d (in)
1.1811
Da max
2.5591 in
da min
1.4567 in
Db max
2.6575 in
db min
1.3583 in
Double Row Width
1.4961 in
Dynamic Load Rating
6950 lbf
Dynamic load rating
6950 lbf
Enclosure
Open
I.D.
30 mm
Limiting Speed - Grease
9600 RPM
Limiting speed - grease
9600 RPM
Limiting Speed - Oil
13000 RPM
Limiting speed - oil
13000 RPM
Material
High carbon chrome steel
O.D.
72 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
4600 lbf
Static load rating
4600 lbf
Triple Row Width
2.2441 in
Type
Angular Contact Ball Bearing
Width
19 mm
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 | 13000 RPM |
Limiting Speed - Grease | 9600 RPM |
Precision | ISO Class 0 |
Configuration | One |
Static Load Rating | 4600 lbf20500 N20.50 kN |
Dynamic Load Rating | 6950 lbf31000 N31.00 kN |
Enclosure | Open |
Weight | 0.787 lb0.357 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.1811 in30.000 mm |
D | 2.8346 in72.000 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) | 1.2402 in31.500 mm |
da min | 1.4567 in37.000 mm |
db min | 1.3583 in34.500 mm |
Da max | 2.5591 in65.000 mm |
Db max | 2.6575 in67.500 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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