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NTN 608LB miniature deep groove ball bearing, 8 mm bore, single non-contact rubber seal, steel cage. Constructed from high carbon chrome steel, this straight bore bearing is designed for light-duty applications requiring low friction and high speed.
MODEL 608LB
$13.23 Each
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Returnable:No
B (in)
0.2756
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)
0.3150
D (in)
0.8661
Da max
0.7874 in
da max
0.4803 in
da min
0.3937 in
Dynamic Load Rating
830 lbf
Dynamic load rating
830 lbf
Enclosure
Single Sealed
Factor
20.0
Limiting Speed - Grease
32000 RPM
Limiting speed - grease
32000 RPM
Limiting Speed - Oil
37000 RPM
Limiting speed - oil
37000 RPM
Material
High carbon chrome steel
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0118
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0118 in
Seal Material
Nitrile Rubber
Seal material
Nitrile rubber
Seal Type
Non-Contact
Seal type
Non-Contact
Static Load Rating
315 lbf
Static load rating
315 lbf
Type
Miniature / Extra Small Ball Bearing
Technical Specifications
Type |
Miniature / Extra Small Ball Bearing |
Bore Type |
Round |
Material |
High Carbon Chrome Steel |
Cage Type |
Pressed |
Cage Material |
Steel |
Ball Material |
Steel |
Limiting Speed - Oil |
37000 RPM |
Limiting Speed - Grease |
32000 RPM |
Seal Type |
Non-Contact |
Seal Material |
Nitrile Rubber |
Precision |
ISO Class 0 |
Configuration |
One |
Factor |
20.0 |
Radial Internal Clearance |
CN |
Static Load Rating |
315 lbf1400 N1.40 kN |
Dynamic Load Rating |
755 lbf3350 N3.35 kN |
Enclosure |
Single Sealed |
Weight |
0.024 lb0.011 kg |
Operating Temperature Range |
-40 to 250 F-40 to 120 C |
Dimensional Specifications
|
|
|
d |
0.3150 in8.000 mm |
D |
0.8661 in22.000 mm |
B |
0.2756 in7.000 mm |
r |
0.0118 in0.300 mm |
da min |
0.3937 in10.000 mm |
da max |
0.4803 in12.200 mm |
Da max |
0.7874 in20.000 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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