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NTN 7304BGC3 is a 73 series single-row angular contact ball bearing with a 20 mm straight bore. Open type with C3 clearance. Designed for combined radial and axial loads in pumps, compressors, and machine tool spindles.
MODEL 7304BGC3
$90.88 Each
Prices are subject to change
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Returnable:No
a (Load Center)
0.8858 in
B (in)
0.5906
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)
2.0472
d (in)
0.7874
Da max
1.7717 in
da min
1.0630 in
Db max
1.8701 in
db min
0.9646 in
Double Row Width
1.1811 in
Dynamic Load Rating
3900 lbf
Dynamic load rating
3900 lbf
Enclosure
Open
I.D.
20 mm
Limiting Speed - Grease
13000 RPM
Limiting speed - grease
13000 RPM
Limiting Speed - Oil
18000 RPM
Limiting speed - oil
18000 RPM
Material
High carbon chrome steel
O.D.
52 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
2.3622 in
r (in)
0.0433
r1
0.0236 in
r1as max
0.0236 in
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0394 in
Static Load Rating
2170 lbf
Static load rating
2170 lbf
Triple Row Width
1.7717 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 | 18000 RPM |
Limiting Speed - Grease | 13000 RPM |
Precision | ISO Class 0 |
Configuration | One |
Radial Internal Clearance | C3 |
Static Load Rating | 2170 lbf9650 N9.65 kN |
Dynamic Load Rating | 3900 lbf17300 N17.30 kN |
Enclosure | Open |
Weight | 0.322 lb0.146 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 0.7874 in20.000 mm |
D | 2.0472 in52.000 mm |
B | 0.5906 in15.000 mm |
r | 0.0433 in1.100 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 40 |
a (Load Center) | 0.8858 in22.500 mm |
da min | 1.0630 in27.000 mm |
db min | 0.9646 in24.500 mm |
Da max | 1.7717 in45.000 mm |
Db max | 1.8701 in47.500 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 mm |
Double Row Width | 1.1811 in30.000 mm |
Triple Row Width | 1.7717 in45.000 mm |
Quadruple Row Width | 2.3622 in60.000 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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