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NTN 7021HVDUJ84 is a 70 series single-row angular contact ball bearing with a 105 mm straight bore. Open enclosure with a phenolic cage. Universal flush ground design for duplex mounting in back-to-back, face-to-face, or tandem arrangements. High carbon chrome steel construction for precision machine tool spindles and high-speed applications.
MODEL 7021HVDUJ84
$3,386.09 Each
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2B
2.0472 in
B (in)
1.0236
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
25 º
d (in)
4.1339
D (in)
6.2992
D1
5.6890 in
d2
4.7441 in
D4
5.9055 in
D5
5.0000 in
E (in)
0.1575
Enclosure
Open
I.D.
105 mm
Material
High carbon chrome steel
O.D.
160 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Medium
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 | Medium |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 4.1339 in105.000 mm |
D | 6.2992 in160.000 mm |
B | 1.0236 in26.000 mm |
2B | 2.0472 in52.000 mm |
r2 max | 0.0787 in2.000 mm |
r3 max | 0.0394 in1.000 mm |
Contact Angle | 25 |
d2 | 4.7441 in120.500 mm |
D1 | 5.6890 in144.500 mm |
D4 | 5.9055 in150.000 mm |
D5 | 5.0000 in127.000 mm |
E | 0.1575 in4.000 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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