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NTN 7208T2DB/GNP5 is a 72 series angular contact ball bearing with a 40 mm straight bore. This duplex set is arranged back-to-back (DB) for increased axial rigidity. Features an open enclosure, polyamide cage, and high carbon chrome steel construction. Suitable for machine tool spindles and precision applications requiring high speed and axial load capacity.
MODEL 7208T2DB/GNP5
$572.53 Each
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2B
1.4173 in
B (in)
0.7087
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Nylon
Cage material
Nylon
Cage Type
Fiber Glass Reinforced
Cage type
Fiber glass reinforced
Configuration
Two
Contact angle
30 º
D (in)
3.1496
d (in)
1.5748
Da max
2.8740 in
da min
1.8504 in
Db max
2.9724 in
Dynamic Load Rating
12900 lbf
Dynamic load rating
12900 lbf
Enclosure
Open
I.D.
40 mm
Limiting Speed - Grease
7700 RPM
Limiting speed - grease
7700 RPM
Limiting Speed - Oil
10000 RPM
Limiting speed - oil
10000 RPM
Material
High carbon chrome steel
O.D.
80 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO Class 5
Preload
Normal
r (in)
0.0433
r1
0.0236 in
r1as max
0.0236 in
ras max
0.0394 in
Static Load Rating
11400 lbf
Static load rating
11400 lbf
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Fiber Glass Reinforced |
Cage Material | Nylon |
Ball Material | Steel |
Limiting Speed - Oil | 10000 RPM |
Limiting Speed - Grease | 7700 RPM |
Precision | ISO Class 5 |
Configuration | Two |
Preload | Normal |
Static Load Rating | 11400 lbf50500 N50.50 kN |
Dynamic Load Rating | 12900 lbf57500 N57.50 kN |
Enclosure | Open |
Weight | 1.594 lb0.723 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
D | 3.1496 in80.000 mm |
B | 0.7087 in18.000 mm |
2B | 1.4173 in36.000 mm |
r | 0.0433 in1.100 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 30 |
da min | 1.8504 in47.000 mm |
Da max | 2.8740 in73.000 mm |
Db max | 2.9724 in75.500 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 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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