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The NTN 6321C3 is a 63 series single-row deep groove ball bearing with a 105 mm straight bore. It features an open enclosure, steel cage, and C3 clearance for applications requiring looser internal fit. Constructed from high carbon chrome steel, it is suitable for electric motors, pumps, fans, and general rotating machinery.
MODEL 6321C3
$730.35 Each
Prices are subject to change
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Returnable:No
Axial Static Load Rating
34396 lbf
Axial static load rating
34396 lbf
B (in)
1.9290
Ball Material
Through Hardened Steel
Ball material
Through hardened steel
Bore Type
Round
Bore type
Round
Cage Material
Pressed Steel
Cage material
Pressed steel
Cage Type
Pressed
Cage type
Pressed
Configuration
One
D (in)
8.8580
d (in)
4.1340
Da max
8.3465 in
da max
5.2756 in
da min
4.6457 in
Dynamic Load Rating
45863 lbf
Dynamic load rating
45863 lbf
Enclosure
Open
Factor
13.2
Height
8.858
I.D.
105 mm
Length
8.858
Limiting Speed - Grease
3000 RPM
Limiting speed - grease
3000 RPM
Limiting Speed - Oil
3600 RPM
Limiting speed - oil
3600 RPM
Material
High carbon chrome steel
O.D.
225 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
0
Precision
ISO class 0
r (in)
0.1181
Radial Dynamic Load Rating
45861 lbf
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0984 in
Seal material
None
Seal type
None
Static Load Rating
34397 lbf
Static load rating
34397 lbf
Type
Deep Groove Ball Bearing
Width
1.9291
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 | 3600 RPM |
Limiting Speed - Grease | 3000 RPM |
Seal Type | None |
Seal Material | None |
Precision | Class 0 |
Configuration | One |
Factor | 13.2 |
Radial Internal Clearance | C3 |
Static Load Rating | 34500 lbf153000 N153.00 kN |
Dynamic Load Rating | 41500 lbf184000 N184.00 kN |
Enclosure | Open |
Weight | 17.769 lb8.060 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
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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