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NTN 6404 64 series single-row deep groove ball bearing, 20 mm straight bore, open type. Designed for general industrial applications including electric motors, pumps, and fans.
MODEL 6404
$73.17 Each
Prices are subject to change
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Returnable:No
B (in)
0.7480
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)
2.8346
d (in)
0.7874
Da max
2.5787 in
da min
1.0433 in
Dynamic Load Rating
7080 lbf
Dynamic load rating
7080 lbf
Enclosure
Open
Factor
11.4
I.D.
20 mm
Limiting Speed - Grease
12000 RPM
Limiting speed - grease
12000 RPM
Limiting Speed - Oil
14000 RPM
Limiting speed - oil
14000 RPM
Material
High carbon chrome steel
O.D.
72 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
Class 0
r (in)
0.0433
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0394 in
Seal material
None
Seal type
None
Static Load Rating
3120 lbf
Static load rating
3120 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 | 14000 RPM |
Limiting Speed - Grease | 12000 RPM |
Seal Type | None |
Seal Material | None |
Precision | Class 0 |
Configuration | One |
Factor | 11.4 |
Radial Internal Clearance | CN |
Static Load Rating | 3150 lbf13900 N13.90 kN |
Dynamic Load Rating | 6400 lbf28500 N28.50 kN |
Enclosure | Open |
Weight | 0.882 lb0.400 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
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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