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The NTN 6318ZC3 is a 63 series single-row deep groove ball bearing with a 90 mm straight bore. It features a single shielded enclosure (steel shield) and C3 internal clearance. The bearing has a steel cage and is made of high carbon chrome steel. Used in electric motors, pumps, fans, and general rotating machinery.
MODEL 6318ZC3
$360.50 Each
Prices are subject to change
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Returnable:No
B (in)
1.6929
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
Configuration
One
D (in)
7.4803
d (in)
3.5433
da max
4.6457 in
Da max
6.9685 in
da min
4.0551 in
Dynamic Load Rating
35510 lbf
Dynamic load rating
35510 lbf
Enclosure
Single Shielded
Factor
177.0
I.D.
90 mm
Limiting Speed - Grease
3600 RPM
Limiting speed - grease
3600 RPM
Limiting Speed - Oil
4200 RPM
Limiting speed - oil
4200 RPM
Material
High carbon chrome steel
O.D.
190 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.1181
r1
0.0197 in
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0984 in
Static Load Rating
24100 lbf
Static load rating
24100 lbf
Type
Deep Groove Ball Bearing
Technical Specifications
Type | Deep Groove Ball Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 4200 RPM |
Limiting Speed - Grease | 3600 RPM |
Precision | ISO Class 0 |
Configuration | One |
Factor | 177.0 |
Radial Internal Clearance | C3 |
Static Load Rating | 24100 lbf107000 N107.00 kN |
Dynamic Load Rating | 32000 lbf143000 N143.00 kN |
Enclosure | Single Shielded |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 3.5433 in90.000 mm |
|---|---|
D | 7.4803 in190.000 mm |
B | 1.6929 in43.000 mm |
r | 0.1181 in3.000 mm |
r1 | 0.0197 in0.500 mm |
da min | 4.0551 in103.000 mm |
da max | 4.6457 in118.000 mm |
Da max | 6.9685 in177.000 mm |
ras max | 0.0984 in2.500 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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