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NTN 3207B double-row angular contact ball bearing with 35 mm straight bore and open design. Accommodates combined radial and axial loads in both directions, providing high stiffness in a compact envelope. Suitable for pumps, electric motors, and gearboxes where bidirectional thrust capacity is required.
MODEL 3207B
$112.66 Each
Prices are subject to change
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a (in)
1.8583
B (in)
1.0630
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
Two
Contact angle
32 º
D (in)
2.8346
d (in)
1.3780
Dynamic Load Rating
8300 lbf
Dynamic load rating
8300 lbf
Enclosure
Open
I.D.
35 mm
Limiting Speed - Grease
6100 RPM
Limiting speed - grease
6100 RPM
Limiting Speed - Oil
8200 RPM
Limiting speed - oil
8200 RPM
Material
High carbon chrome steel
O.D.
72 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
Straight
Precision
Class 0
r (in)
0.0394
Radial Internal Clearance
CN
Radial internal clearance
CN
Static Load Rating
8450 lbf
Static load rating
8450 lbf
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
|---|---|
Bore Type | Round |
Outside Ring Type | Straight |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 8200 RPM |
Limiting Speed - Grease | 6100 RPM |
Precision | Class 0 |
Configuration | Two |
Radial Internal Clearance | CN |
Static Load Rating | 8450 lbf37500 N37.50 kN |
Dynamic Load Rating | 8300 lbf37000 N37.00 kN |
Enclosure | Open |
Weight | 1.058 lb0.480 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.3780 in35.000 mm |
|---|---|
D | 2.8346 in72.000 mm |
B | 1.0630 in27.000 mm |
r | 0.0394 in1.000 mm |
Contact Angle | 32 |
a | 1.8583 in47.200 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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