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NTN 7328BG is a single-row angular contact ball bearing with a 140 mm straight bore. It features an open enclosure and a brass cage, designed for high-speed and high-precision applications such as machine tool spindles and pumps.
MODEL 7328BG
$3,323.79 Each
Prices are subject to change
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Returnable:No
a (Load Center)
4.8425 in
B (in)
2.4409
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Brass
Cage material
Brass
Cage Type
High Strength, 2 piece, Machined
Cage type
High strength, 2 piece, machined
Configuration
One
Contact angle
40 º
d (in)
5.5118
D (in)
11.8110
Da max
11.1024 in
da min
6.2205 in
Db max
11.4764 in
Double Row Width
4.8819 in
Dynamic Load Rating
62000 lbf
Dynamic load rating
62000 lbf
Enclosure
Open
I.D.
140 mm
Limiting Speed - Grease
2100 RPM
Limiting speed - grease
2100 RPM
Limiting Speed - Oil
2800 RPM
Limiting speed - oil
2800 RPM
Material
High carbon chrome steel
O.D.
300 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
9.7638 in
r (in)
0.1575
r1
0.0591 in
r1as max
0.0591 in
ras max
0.1181 in
Static Load Rating
69500 lbf
Static load rating
69500 lbf
Triple Row Width
7.3228 in
Type
Angular Contact Ball Bearing
Technical Specifications
| Type | Angular Contact Ball Bearing |
|---|---|
| Bore Type | Round |
| Material | High Carbon Chrome Steel |
| Cage Type | High Strength, 2 piece, Machined |
| Cage Material | Brass |
| Ball Material | Steel |
| Limiting Speed - Oil | 2800 RPM |
| Limiting Speed - Grease | 2100 RPM |
| Precision | ISO Class 0 |
| Configuration | One |
| Static Load Rating | 69500 lbf310000 N310.00 kN |
| Dynamic Load Rating | 62000 lbf275000 N275.00 kN |
| Enclosure | Open |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 5.5118 in140.000 mm |
|---|---|
| D | 11.8110 in300.000 mm |
| B | 2.4409 in62.000 mm |
| r | 0.1575 in4.000 mm |
| r1 | 0.0591 in1.500 mm |
| Contact Angle | 40 |
| a (Load Center) | 4.8425 in123.000 mm |
| da min | 6.2205 in158.000 mm |
| Da max | 11.1024 in282.000 mm |
| Db max | 11.4764 in291.500 mm |
| ras max | 0.1181 in3.000 mm |
| r1as max | 0.0591 in1.500 mm |
| Double Row Width | 4.8819 in124.000 mm |
| Triple Row Width | 7.3228 in186.000 mm |
| Quadruple Row Width | 9.7638 in248.000 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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