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The NTN 6904LLU is a 6900 series single-row deep groove ball bearing with a 20 mm straight bore. It features double contact rubber seals (LLU) for effective contaminant exclusion. This bearing is designed for light-duty applications such as small electric motors, instruments, and hand tools.
MODEL 6904LLU
$8.15 Each
Prices are subject to change
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Returnable:No
B (in)
0.3543
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)
1.4567
d (in)
0.7874
da max
0.9449 in
Da max
1.3780 in
Dynamic Load Rating
1580 lbf
Dynamic load rating
1580 lbf
Enclosure
Double Sealed
Factor
14.7
I.D.
20 mm
Limiting Speed - Grease
12000 RPM
Limiting speed - grease
12000 RPM
Material
High carbon chrome steel
O.D.
37 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0118
r1
0.0118 in
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0118 in
Seal Material
Nitrile Rubber
Seal material
Nitrile rubber
Seal Type
Contact
Seal type
Contact
Static Load Rating
830 lbf
Static load rating
830 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 - Grease |
12000 RPM |
Seal Type |
Contact |
Seal Material |
Nitrile Rubber |
Precision |
ISO Class 0 |
Configuration |
One |
Factor |
14.7 |
Radial Internal Clearance |
CN |
Static Load Rating |
830 lbf3700 N3.70 kN |
Dynamic Load Rating |
1440 lbf6400 N6.40 kN |
Enclosure |
Double Sealed |
Weight |
0.068 lb0.031 kg |
Operating Temperature Range |
-40 to 250 F-40 to 120 C |
Dimensional Specifications
|
|
|
d |
0.7874 in20.000 mm |
D |
1.4567 in37.000 mm |
B |
0.3543 in9.000 mm |
r |
0.0118 in0.300 mm |
r1 |
0.0118 in0.300 mm |
da max |
0.9449 in24.000 mm |
Da max |
1.3780 in35.000 mm |
ras max |
0.0118 in0.300 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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