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NTN 7018CDB/GNP4 is a duplex angular contact ball bearing with a back-to-back arrangement, 90 mm bore, and open enclosure. It features a nylon cage and P4 precision class. Designed for high-speed, high-accuracy applications such as machine tool spindles and precision gearboxes.
MODEL 7018CDB/GNP4
$2,135.99 Each
Prices are subject to change
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Returnable:No
2B
1.8898 in
B (in)
0.9449
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Nylon
Cage material
Nylon
Cage Type
Fiber Glass Reinforced
Cage type
Fiber glass reinforced
Configuration
Two
Contact angle
15 º
D (in)
5.5118
d (in)
3.5433
D1
4.8504 in
d1
4.2087 in
D2
5.1614 in
d2
4.0551 in
Da max
5.1772 in
da min
3.8780 in
Db max
5.2953 in
Enclosure
Open
I.D.
90 mm
Limiting Speed - Grease
8160 RPM
Limiting speed - grease
8160 RPM
Limiting Speed - Oil
13040 RPM
Limiting speed - oil
13040 RPM
Material
High carbon chrome steel
O.D.
140 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Normal
r (in)
0.0591
r1
0.0236 in
r1as max
0.0394 in
ras max
0.0591 in
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Fiber Glass Reinforced |
Cage Material | Nylon |
Ball Material | Steel |
Limiting Speed - Oil | 13040 RPM |
Limiting Speed - Grease | 8160 RPM |
Precision | ISO Class 4 |
Configuration | Two |
Preload | Normal |
Enclosure | Open |
Weight | 5.029 lb2.281 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 3.5433 in90.000 mm |
D | 5.5118 in140.000 mm |
B | 0.9449 in24.000 mm |
2B | 1.8898 in48.000 mm |
d1 | 4.2087 in106.900 mm |
d2 | 4.0551 in103.000 mm |
D1 | 4.8504 in123.200 mm |
D2 | 5.1614 in131.100 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 15 |
da min | 3.8780 in98.500 mm |
Da max | 5.1772 in131.500 mm |
Db max | 5.2953 in134.500 mm |
ras max | 0.0591 in1.500 mm |
r1as max | 0.0394 in1.000 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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