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NTN CH7209HG1DUJ74 is a duplex hybrid angular contact ball bearing with a 45 mm straight bore. It features an open enclosure, phenolic cage, and high carbon chrome steel construction. The universal flush ground design allows for back-to-back, face-to-face, or tandem mounting configurations. Suitable for high-precision machine tool spindles and high-speed applications.
MODEL CH7209HG1DUJ74
$1,319.01 Each
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2B
1.4961 in
B (in)
0.7480
Ball Material
Ceramic
Ball material
Ceramic
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)
1.7717
D (in)
3.3465
D1
2.8543 in
d2
2.2598 in
D4
3.0512 in
D5
2.4291 in
E (in)
0.1693
Enclosure
Open
I.D.
45 mm
Material
High carbon chrome steel
O.D.
85 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Light
r2 max
0.0433 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 | Ceramic |
Precision | ISO Class 4 |
Configuration | Two |
Preload | Light |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.7717 in45.000 mm |
D | 3.3465 in85.000 mm |
B | 0.7480 in19.000 mm |
2B | 1.4961 in38.000 mm |
r2 max | 0.0433 in1.100 mm |
r3 max | 0.0236 in0.600 mm |
Contact Angle | 25 |
d2 | 2.2598 in57.400 mm |
D1 | 2.8543 in72.500 mm |
D4 | 3.0512 in77.500 mm |
D5 | 2.4291 in61.700 mm |
E | 0.1693 in4.300 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.
| Brand | Littelfuse |
| Model | LA100URD73TTI0900 |
| Brand | Bell & Gossett |
| Model | 117106LF |
