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NTN 7303B is a single-row angular contact ball bearing with a 17 mm straight bore. Open type design with no seals or shields. Suitable for high-speed and precision applications requiring combined radial and axial load capacity.
MODEL 7303B
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$51.59 Each
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Brand Minimum Order Quantity: 2
Typically Ships in: 1 day
Returnable:No
a (Load Center)
0.8071 in
B (in)
0.5512
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)
1.8504
d (in)
0.6693
Da max
1.6339 in
da min
0.8858 in
Db max
1.6732 in
db min
0.8465 in
Double Row Width
1.1024 in
Dynamic Load Rating
3350 lbf
Dynamic load rating
3350 lbf
Enclosure
Open
I.D.
17 mm
Limiting Speed - Grease
15000 RPM
Limiting speed - grease
15000 RPM
Limiting Speed - Oil
20000 RPM
Limiting speed - oil
20000 RPM
Material
High carbon chrome steel
O.D.
47 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
Quadruple Row Width
2.2047 in
r (in)
0.0394
r1
0.0236 in
r1as max
0.0236 in
ras max
0.0394 in
Static Load Rating
1800 lbf
Static load rating
1800 lbf
Triple Row Width
1.6535 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 | 20000 RPM |
Limiting Speed - Grease | 15000 RPM |
Precision | ISO Class 0 |
Configuration | One |
Static Load Rating | 1800 lbf8000 N8.00 kN |
Dynamic Load Rating | 3350 lbf14800 N14.80 kN |
Enclosure | Open |
Weight | 0.256 lb0.116 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 0.6693 in17.000 mm |
D | 1.8504 in47.000 mm |
B | 0.5512 in14.000 mm |
r | 0.0394 in1.000 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 40 |
a (Load Center) | 0.8071 in20.500 mm |
da min | 0.8858 in22.500 mm |
db min | 0.8465 in21.500 mm |
Da max | 1.6339 in41.500 mm |
Db max | 1.6732 in42.500 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 mm |
Double Row Width | 1.1024 in28.000 mm |
Triple Row Width | 1.6535 in42.000 mm |
Quadruple Row Width | 2.2047 in56.000 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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