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NTN 608LLB/7.938PX2 miniature deep groove ball bearing with a 7.938 mm bore. Double sealed with non-contact rubber seals for low-friction protection. Features a steel cage and straight bore design. Suitable for small electric motors, instruments, and precision equipment.
MODEL 608LLB/7.938PX2
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$21.18 Each
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Brand Minimum Order Quantity: 4
Typically Ships in: 1 day
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)
0.8661
d (in)
0.3125
Dynamic Load Rating
830 lbf
Dynamic load rating
830 lbf
Enclosure
Double Sealed
Factor
12.5
I.D.
7.938 mm
Limiting Speed - Grease
32000 RPM
Limiting speed - grease
32000 RPM
Material
High carbon chrome steel
O.D.
22 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
Special tolerance
r (in)
0.0118
Radial Internal Clearance
CN
Radial internal clearance
CN
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 - Grease | 32000 RPM |
| Seal Type | Non-Contact |
| Seal Material | Nitrile Rubber |
| Precision | Special tolerance |
| Configuration | One |
| Factor | 12.5 |
| Radial Internal Clearance | CN |
| Static Load Rating | 315 lbf1400 N1.40 kN |
| Dynamic Load Rating | 755 lbf3350 N3.35 kN |
| Enclosure | Double Sealed |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 0.3125 in7.938 mm |
|---|---|
| D | 0.8661 in22.000 mm |
| B | 0.2756 in7.000 mm |
| r | 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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