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NTN 7218CG1DUJ84 is a 72 series single-row angular contact ball bearing with a 90 mm straight bore. Open design with a phenolic cage and universal flush ground faces for duplex mounting. Constructed from high carbon chrome steel for precision applications such as machine tool spindles and high-speed spindles.
MODEL 7218CG1DUJ84
$3,166.93 Each
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2B
2.3622 in
B (in)
1.1811
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)
6.2992
d (in)
3.5433
D1
5.4724 in
d2
4.3701 in
D4
5.8661 in
D5
4.6142 in
E (in)
0.1299
Enclosure
Open
I.D.
90 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 | 3.5433 in90.000 mm |
D | 6.2992 in160.000 mm |
B | 1.1811 in30.000 mm |
2B | 2.3622 in60.000 mm |
r2 max | 0.0787 in2.000 mm |
r3 max | 0.0394 in1.000 mm |
Contact Angle | 15 |
d2 | 4.3701 in111.000 mm |
D1 | 5.4724 in139.000 mm |
D4 | 5.8661 in149.000 mm |
D5 | 4.6142 in117.200 mm |
E | 0.1299 in3.300 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.
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