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The NTN 71908CVUJ84 is a 71 series single-row angular contact ball bearing with a 40 mm straight bore. It features an open design with a phenolic cage and is constructed from high carbon chrome steel. This high-precision bearing is suitable for machine tool spindles and other applications requiring accurate axial and radial load support.
MODEL 71908CVUJ84
$357.82 Each
Prices are subject to change
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a (Load Center)
0.5118 in
B (in)
0.4724
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Phenolic
Cage material
Phenolic
Cage Type
Stratified
Cage type
Stratified
Configuration
One
Contact angle
15 º
D (in)
2.4409
d (in)
1.5748
D1
2.1732 in
d2
1.8425 in
D4
2.2520 in
D5
0.0858 in
Double Row Width
0.9449 in
Dynamic Load Rating
3308 lbf
Dynamic load rating
3308 lbf
E (in)
2.180
Enclosure
Open
I.D.
40 mm
Limiting Speed - Grease
21000 RPM
Limiting speed - grease
21000 RPM
Limiting Speed - Oil
33000 RPM
Limiting speed - oil
33000 RPM
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
Medium
Quadruple Row Width
1.8898 in
r2 max
0.0236 in
r3 max
0.0118 in
Static Load Rating
2655 lbf
Static load rating
2655 lbf
Triple Row Width
1.4173 in
Type
Angular Contact Ball Bearing
Width
12 mm
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Stratified |
Cage Material | Phenolic |
Ball Material | Steel |
Limiting Speed - Oil | 33000 RPM |
Limiting Speed - Grease | 21000 RPM |
Precision | ISO Class 4 |
Configuration | One |
Preload | Medium |
Static Load Rating | 2655 lbf11800 N11.80 kN |
Dynamic Load Rating | 3308 lbf14700 N14.70 kN |
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 |
r2 max | 0.0236 in0.600 mm |
r3 max | 0.0118 in0.300 mm |
Contact Angle | 15 |
a (Load Center) | 0.5118 in13.000 mm |
d2 | 1.8425 in46.800 mm |
D1 | 2.1732 in55.200 mm |
D4 | 2.2520 in57.200 mm |
D5 | 0.0858 in1.9291 mm |
E | 2.180 in49.000 mm |
Double Row Width | 0.9449 in24.000 mm |
Triple Row Width | 1.4173 in36.000 mm |
Quadruple Row Width | 1.8898 in48.000 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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