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The NTN 7908CDTBT/G5P4 is a precision angular contact ball bearing with a 40 mm straight bore, arranged in a tandem duplex (DT) configuration. It features a nylon cage, open enclosure, and high carbon chrome steel construction. Rated to ISO P4 super-precision tolerance, this bearing is designed for high-speed, high-accuracy applications such as machine tool spindles.
MODEL 7908CDTBT/G5P4
$1,668.01 Each
Prices are subject to change
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Returnable:No
B (in)
0.4724
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
Four
Contact angle
15 º
D (in)
2.4409
d (in)
1.5748
Da max
2.2638 in
da min
1.7520 in
Db max
2.3425 in
Enclosure
Open
I.D.
40 mm
Material
High carbon chrome steel
O.D.
62 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Special preload
r (in)
0.0236
r1
0.0118 in
r1as max
0.0118 in
ras max
0.0236 in
Total width
1.8898 in
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 |
| Precision | ISO Class 4 |
| Configuration | Four |
| Preload | Special Preload |
| Enclosure | Open |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 1.5748 in40.000 mm |
|---|---|
| D | 2.4409 in62.000 mm |
| B | 0.4724 in12.000 mm |
| Total Width | 1.8898 in48.000 mm |
| r | 0.0236 in0.600 mm |
| r1 | 0.0118 in0.300 mm |
| Contact Angle | 15 |
| da min | 1.7520 in44.500 mm |
| Da max | 2.2638 in57.500 mm |
| Db max | 2.3425 in59.500 mm |
| ras max | 0.0236 in0.600 mm |
| r1as max | 0.0118 in0.300 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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