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NTN 7318BG is a 73 series single-row angular contact ball bearing with a 90 mm straight bore. Open type with a steel cage, made from high carbon chrome steel. Designed for combined radial and axial loads in pumps, compressors, and machine tool spindles.
MODEL 7318BG
$663.22 Each
Prices are subject to change
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Returnable:No
a (Load Center)
3.1693 in
B (in)
1.6929
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)
7.4803
d (in)
3.5433
Da max
6.9291 in
da min
4.0945 in
Db max
7.2047 in
db min
3.8189 in
Double Row Width
3.3858 in
Dynamic Load Rating
35000 lbf
Dynamic load rating
35000 lbf
Enclosure
Open
I.D.
90 mm
Limiting Speed - Grease
3400 RPM
Limiting speed - grease
3400 RPM
Limiting Speed - Oil
4500 RPM
Limiting speed - oil
4500 RPM
Material
High carbon chrome steel
O.D.
190 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
6.7717 in
r (in)
0.1181
r1
0.0433 in
r1as max
0.0394 in
ras max
0.0984 in
Static Load Rating
30500 lbf
Static load rating
30500 lbf
Triple Row Width
5.0787 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 | 4500 RPM |
Limiting Speed - Grease | 3400 RPM |
Precision | ISO Class 0 |
Configuration | One |
Static Load Rating | 30500 lbf135000 N135.00 kN |
Dynamic Load Rating | 35000 lbf156000 N156.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 3.5433 in90.000 mm |
|---|---|
D | 7.4803 in190.000 mm |
B | 1.6929 in43.000 mm |
r | 0.1181 in3.000 mm |
r1 | 0.0433 in1.100 mm |
Contact Angle | 40 |
a (Load Center) | 3.1693 in80.500 mm |
da min | 4.0945 in104.000 mm |
db min | 3.8189 in97.000 mm |
Da max | 6.9291 in176.000 mm |
Db max | 7.2047 in183.000 mm |
ras max | 0.0984 in2.500 mm |
r1as max | 0.0394 in1.000 mm |
Double Row Width | 3.3858 in86.000 mm |
Triple Row Width | 5.0787 in129.000 mm |
Quadruple Row Width | 6.7717 in172.000 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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