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NTN 71938CVDUJ74 is a high-precision duplex angular contact ball bearing with a 190 mm straight bore. Features a phenolic cage and open design, universal flush ground for mounting in pairs. Suitable for machine tool spindles and high-speed applications.
MODEL 71938CVDUJ74
$11,394.60 Each
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2B
2.5984 in
B (in)
1.2992
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
Two
Contact angle
15 º
D (in)
10.2362
d (in)
7.4803
D1
9.4094 in
d2
8.3071 in
D4
9.7441 in
D5
8.5945 in
E (in)
0.1850
Enclosure
Open
I.D.
190 mm
Material
High carbon chrome steel
O.D.
260 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Light
r2 max
0.0787 in
r3 max
0.0394 in
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Stratified |
Cage Material | Phenolic |
Ball Material | Steel |
Precision | ISO Class 4 |
Configuration | Two |
Preload | Light |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 7.4803 in190.000 mm |
D | 10.2362 in260.000 mm |
B | 1.2992 in33.000 mm |
2B | 2.5984 in66.000 mm |
r2 max | 0.0787 in2.000 mm |
r3 max | 0.0394 in1.000 mm |
Contact Angle | 15 |
d2 | 8.3071 in211.000 mm |
D1 | 9.4094 in239.000 mm |
D4 | 9.7441 in247.500 mm |
D5 | 8.5945 in218.300 mm |
E | 0.1850 in4.700 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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