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NTN 6308N is a 63 series single-row deep groove ball bearing with a 40 mm straight bore. It is an open type bearing with a snap ring groove in the outer ring for axial location. Suitable for electric motors, pumps, and general industrial machinery.
MODEL 6308N
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$55.84 Each
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Brand Minimum Order Quantity: 2
Typically Ships in: 1 day
Returnable:No
a (in)
0.1291
b (in)
0.1063
B (in)
0.9055
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)
1.5748
D (in)
3.5433
D1
3.4169 in
da max
2.1260 in
Da max
3.2283 in
da min
1.8898 in
Dynamic Load Rating
10110 lbf
Dynamic load rating
10110 lbf
Enclosure
Open
Factor
13.2
I.D.
40 mm
Limiting Speed - Grease
7800 RPM
Limiting speed - grease
7800 RPM
Limiting Speed - Oil
9200 RPM
Limiting speed - oil
9200 RPM
Material
High carbon chrome steel
O.D.
90 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
Class 0
r (in)
0.0591
r1
0.0197 in
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0591 in
Seal material
None
Seal type
None
Static Load Rating
5400 lbf
Static load rating
5400 lbf
Type
Deep Groove Ball Bearing
Width
23 mm
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 | 9200 RPM |
Limiting Speed - Grease | 7800 RPM |
Seal Type | None |
Seal Material | None |
Precision | Class 0 |
Configuration | One |
Factor | 13.2 |
Radial Internal Clearance | CN |
Static Load Rating | 5400 lbf24000 N24.00 kN |
Dynamic Load Rating | 9100 lbf40500 N40.50 kN |
Enclosure | Open |
Weight | 1.371 lb0.622 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
D | 3.5433 in90.000 mm |
B | 0.9055 in23.000 mm |
D1 | 3.4169 in86.790 mm |
a | 0.1291 in3.280 mm |
b | 0.1063 in2.700 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0197 in0.500 mm |
da min | 1.8898 in48.000 mm |
da max | 2.1260 in54.000 mm |
Da max | 3.2283 in82.000 mm |
ras max | 0.0591 in1.500 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.
