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NTN 5S-BNT908DTP2 is a double angular contact ball bearing in a tandem arrangement with a 40 mm straight bore. It features an open enclosure, phenolic resin cage, and P2 precision class. Constructed from high carbon chrome steel, this main spindle bearing is designed for high-speed machine tool spindles and lathes.
MODEL 5S-BNT908DTP2
$2,843.67 Each
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2B
0.9449 in
B (in)
0.4724
Ball Material
Ceramic
Ball material
Ceramic
Bore Type
Round
Bore type
Round
Cage Material
Phenolic Resin
Cage material
Phenolic resin
Cage Type
Machined
Cage type
Machined
Configuration
Two
Contact angle
15 º
D (in)
2.4409
d (in)
1.5748
D1
2.1654 in
d1
1.8504 in
d2
1.7480 in
Da max
2.2638 in
da min
1.7520 in
db min
1.6732 in
Enclosure
Open
Material
High carbon chrome steel
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 2
r (in)
0.0236
r1
0.0118 in
r1as max
0.0118 in
ras max
0.0236 in
Seal material
None
Seal type
None
Type
Main Spindle Bearing
Technical Specifications
Type | Main Spindle Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Machined |
Cage Material | Phenolic Resin |
Ball Material | Ceramic |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 2 |
Configuration | Two |
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 |
2B | 0.9449 in24.000 mm |
d1 | 1.8504 in47.000 mm |
d2 | 1.7480 in44.400 mm |
D1 | 2.1654 in55.000 mm |
r | 0.0236 in0.600 mm |
r1 | 0.0118 in0.300 mm |
Contact Angle | 15 |
da min | 1.7520 in44.500 mm |
db min | 1.6732 in42.500 mm |
Da max | 2.2638 in57.500 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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