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NTN 7008 is a 70 series single-row angular contact ball bearing with a 40 mm straight bore. Open design with no seals or shields. Suitable for high-speed and precision applications requiring combined radial and axial load capacity.
MODEL 7008
$159.87 Each
Prices are subject to change
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Typically Ships in: 1 day
Returnable:No
Enclosure
Open
Height
2.677
I.D.
40 mm
Length
2.677
O.D.
68 mm
Width
0.5906
Technical Specifications
Type | Angular Contact Ball Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Fiber Glass Reinforced |
Cage Material | Nylon |
Ball Material | Steel |
Limiting Speed - Oil | 14000 RPM |
Limiting Speed - Grease | 10000 RPM |
Precision | ISO Class 0 |
Configuration | One |
Static Load Rating | 3300 lbf14600 N14.60 kN |
Dynamic Load Rating | 4250 lbf18800 N18.80 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
|---|---|
D | 2.6772 in68.000 mm |
B | 0.5906 in15.000 mm |
r | 0.0394 in1.000 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 30 |
a (Load Center) | 0.9055 in23.000 mm |
da min | 1.7913 in45.500 mm |
Da max | 2.4606 in62.500 mm |
Db max | 2.5000 in63.500 mm |
ras max | 0.0394 in1.000 mm |
r1as max | 0.0236 in0.600 mm |
Double Row Width | 1.1811 in30.000 mm |
Triple Row Width | 1.7717 in45.000 mm |
Quadruple Row Width | 2.3622 in60.000 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.