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NTN 7211CG1DUJ74 is a 72 series single-row angular contact ball bearing with a 55 mm straight bore. Open design with a phenolic cage. Duplex universal flush ground configuration allows mounting in tandem, back-to-back, or face-to-face arrangements. Made from high carbon chrome steel for precision spindle and machine tool applications.
MODEL 7211CG1DUJ74
$1,110.62 Each
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2B
1.6535 in
B (in)
0.8268
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)
3.9370
d (in)
2.1654
D1
3.4252 in
d2
2.6772 in
D4
3.6417 in
D5
2.8543 in
E (in)
0.0827
Enclosure
Open
I.D.
55 mm
Material
High carbon chrome steel
O.D.
100 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Light
r2 max
0.0591 in
r3 max
0.0236 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 | 2.1654 in55.000 mm |
|---|---|
D | 3.9370 in100.000 mm |
B | 0.8268 in21.000 mm |
2B | 1.6535 in42.000 mm |
r2 max | 0.0591 in1.500 mm |
r3 max | 0.0236 in0.600 mm |
Contact Angle | 15 |
d2 | 2.6772 in68.000 mm |
D1 | 3.4252 in87.000 mm |
D4 | 3.6417 in92.500 mm |
D5 | 2.8543 in72.500 mm |
E | 0.0827 in2.100 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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